Standard accessor task that iterates over the elements of the collection.
Used to iterate elements using indices
Performs two tasks in parallel, and waits for both to finish.
An iterator that can be split into arbitrary subsets of iterators.
Sequentially performs one task after another.
A stackable modification that ensures signal contexts get passed along the iterators.
Selects an element by its index in the general sequence.
Selects an element by its index in the general sequence.
The index to select.
the element of this general sequence at index idx
, where 0
indicates the first element.
The length of the general sequence.
The length of the general sequence.
Note: will not terminate for infinite-sized collections.
Note: xs.length
and xs.size
yield the same result.
the number of elements in this general sequence.
A more refined version of the iterator found in the ParallelIterable
trait,
this iterator can be split into arbitrary subsets of iterators.
A more refined version of the iterator found in the ParallelIterable
trait,
this iterator can be split into arbitrary subsets of iterators.
an iterator that can be split into subsets of precise size
Defines the prefix of this object's toString
representation.
Defines the prefix of this object's toString
representation.
a string representation which starts the result of toString
applied to this general sequence. By default the string prefix is the
simple name of the collection class general sequence.
Test two objects for inequality.
Test two objects for inequality.
true
if !(this == that), false otherwise.
Equivalent to x.hashCode
except for boxed numeric types.
Equivalent to x.hashCode
except for boxed numeric types.
For numerics, it returns a hash value which is consistent
with value equality: if two value type instances compare
as true, then ## will produce the same hash value for each
of them.
a hash value consistent with ==
[use case] Concatenates this general sequence with the elements of a traversable collection.
Concatenates this general sequence with the elements of a traversable collection.
the element type of the returned collection.
the traversable to append.
a new collection of type That
which contains all elements
of this general sequence followed by all elements of that
.
Concatenates this general sequence with the elements of a traversable collection.
Concatenates this general sequence with the elements of a traversable collection.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the traversable to append.
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
which contains all elements
of this general sequence followed by all elements of that
.
[use case] Prepends an element to this general sequence
Prepends an element to this general sequence
the prepended element
a new collection of type That
consisting of elem
followed
by all elements of this general sequence.
Prepends an element to this general sequence
Prepends an element to this general sequence
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the prepended element
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
consisting of elem
followed
by all elements of this general sequence.
Applies a binary operator to a start value and all elements of this general sequence, going left to right.
Applies a binary operator to a start value and all elements of this general sequence, going left to right.
Note: /:
is alternate syntax for foldLeft
; z /: xs
is the same as
xs foldLeft z
.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this general sequence,
going left to right with the start value z
on the left:
op(...op(op(z, x,,1,,), x,,2,,), ..., x,,n,,)
where x,,1,,, ..., x,,n,,
are the elements of this general sequence.
A syntactic sugar for out of order folding.
A syntactic sugar for out of order folding. See fold
.
[use case] Appends an element to this general sequence
Appends an element to this general sequence
Note: will not terminate for infinite-sized collections.
the appended element
a new collection of type That
consisting of
all elements of this general sequence followed by elem
.
Appends an element to this general sequence
Appends an element to this general sequence
Note: will not terminate for infinite-sized collections.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the appended element
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
consisting of
all elements of this general sequence followed by elem
.
Applies a binary operator to all elements of this general sequence and a start value, going right to left.
Applies a binary operator to all elements of this general sequence and a start value, going right to left.
Note: :\
is alternate syntax for foldRight
; xs :\ z
is the same as
xs foldRight z
.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the start value
the binary operator
the result of inserting op
between consecutive elements of this general sequence,
going right to left with the start value z
on the right:
op(x,,1,,, op(x,,2,,, ... op(x,,n,,, z)...))
where x,,1,,, ..., x,,n,,
are the elements of this general sequence.
Test two objects for equality.
Test two objects for equality.
true
if the receiver object is equivalent to the argument; false
otherwise.
Aggregates the results of applying an operator to subsequent elements.
Aggregates the results of applying an operator to subsequent elements.
This is a more general form of fold
and reduce
. It has similar semantics, but does
not require the result to be a supertype of the element type. It traverses the elements in
different partitions sequentially, using seqop
to update the result, and then
applies combop
to results from different partitions. The implementation of this
operation may operate on an arbitrary number of collection partitions, so combop
may be invoked arbitrary number of times.
For example, one might want to process some elements and then produce a Set
. In this
case, seqop
would process an element and append it to the list, while combop
would concatenate two lists from different partitions together. The initial value
z
would be an empty set.
pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)
Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).
the type of accumulated results
the initial value for the accumulated result of the partition - this
will typically be the neutral element for the seqop
operator (e.g.
Nil
for list concatenation or 0
for summation)
an operator used to accumulate results within a partition
an associative operator used to combine results from different partitions
Cast the receiver object to be of type T0
.
Cast the receiver object to be of type T0
.
Note that the success of a cast at runtime is modulo Scala's erasure semantics.
Therefore the expression 1.asInstanceOf[String]
will throw a ClassCastException
at
runtime, while the expression List(1).asInstanceOf[List[String]]
will not.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the requested type.
the receiver object.
Create a copy of the receiver object.
[use case] Builds a new collection by applying a partial function to all elements of this general sequence on which the function is defined.
Builds a new collection by applying a partial function to all elements of this general sequence on which the function is defined.
the element type of the returned collection.
the partial function which filters and maps the general sequence.
a new collection of type That
resulting from applying the partial function
pf
to each element on which it is defined and collecting the results.
The order of the elements is preserved.
Builds a new collection by applying a partial function to all elements of this general sequence on which the function is defined.
Builds a new collection by applying a partial function to all elements of this general sequence on which the function is defined.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the partial function which filters and maps the general sequence.
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
resulting from applying the partial function
pf
to each element on which it is defined and collecting the results.
The order of the elements is preserved.
[use case] Copies values of this general sequence to an array.
Copies values of this general sequence to an array.
Fills the given array xs
with values of this general sequence, beginning at index start
.
Copying will stop once either the end of the current general sequence is reached,
or the end of the array is reached.
the array to fill.
the starting index.
Copies values of this general sequence to an array.
Copies values of this general sequence to an array.
Fills the given array xs
with values of this general sequence, beginning at index start
.
Copying will stop once either the end of the current general sequence is reached,
or the end of the array is reached.
Note: will not terminate for infinite-sized collections.
the array to fill.
the starting index.
[use case] Copies values of this general sequence to an array.
Copies values of this general sequence to an array.
Fills the given array xs
with values of this general sequence.
Copying will stop once either the end of the current general sequence is reached,
or the end of the array is reached.
the array to fill.
Copies values of this general sequence to an array.
Copies values of this general sequence to an array.
Fills the given array xs
with values of this general sequence.
Copying will stop once either the end of the current general sequence is reached,
or the end of the array is reached.
Note: will not terminate for infinite-sized collections.
the array to fill.
Tests whether every element of this general sequence relates to the corresponding element of another parallel sequence by satisfying a test predicate.
Tests whether every element of this general sequence relates to the corresponding element of another parallel sequence by satisfying a test predicate.
This method will use abort
signalling capabilities. This means
that splitters may send and read abort
signals.
the type of the elements of that
the other parallel sequence
the test predicate, which relates elements from both sequences
true
if both parallel sequences have the same length and
p(x, y)
is true
for all corresponding elements x
of this general sequence
and y
of that
, otherwise false
Counts the number of elements in the general sequence which satisfy a predicate.
Counts the number of elements in the general sequence which satisfy a predicate.
the predicate used to test elements.
the number of elements satisfying the predicate p
.
[use case] Computes the multiset difference between this general sequence and another sequence.
Computes the multiset difference between this general sequence and another sequence.
Note: will not terminate for infinite-sized collections.
the sequence of elements to remove
a new collection of type That
which contains all elements of this general sequence
except some of occurrences of elements that also appear in that
.
If an element value x
appears
n times in that
, then the first n occurrences of x
will not form
part of the result, but any following occurrences will.
Computes the multiset difference between this general sequence and another sequence.
Computes the multiset difference between this general sequence and another sequence.
Note: will not terminate for infinite-sized collections.
the sequence of elements to remove
a new collection of type That
which contains all elements of this general sequence
except some of occurrences of elements that also appear in that
.
If an element value x
appears
n times in that
, then the first n occurrences of x
will not form
part of the result, but any following occurrences will.
Builds a new general sequence from this general sequence without any duplicate elements.
Builds a new general sequence from this general sequence without any duplicate elements.
Note: will not terminate for infinite-sized collections.
A new general sequence which contains the first occurrence of every element of this general sequence.
Selects all elements except first n ones.
Selects all elements except first n ones.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the number of elements to drop from this general sequence.
a general sequence consisting of all elements of this general sequence except the first n
ones, or else the
empty general sequence, if this general sequence has less than n
elements.
Drops all elements in the longest prefix of elements that satisfy the predicate, and returns a collection composed of the remaining elements.
Drops all elements in the longest prefix of elements that satisfy the predicate, and returns a collection composed of the remaining elements.
This method will use indexFlag
signalling capabilities. This means
that splitters may set and read the indexFlag
state.
The index flag is initially set to maximum integer value.
the predicate used to test the elements
a collection composed of all the elements after the longest prefix of elements
in this general sequence that satisfy the predicate pred
Tests whether this general sequence ends with the given parallel sequence.
Tests whether this general sequence ends with the given parallel sequence.
This method will use abort
signalling capabilities. This means
that splitters may send and read abort
signals.
the type of the elements of that
sequence
the sequence to test
true
if this general sequence has that
as a suffix, false
otherwise
Tests whether the argument (arg0
) is a reference to the receiver object (this
).
Tests whether the argument (arg0
) is a reference to the receiver object (this
).
The eq
method implements an equivalence relation on
non-null instances of AnyRef
, and has three additional properties:
x
and y
of type AnyRef
, multiple invocations of
x.eq(y)
consistently returns true
or consistently returns false
.x
of type AnyRef
, x.eq(null)
and null.eq(x)
returns false
.null.eq(null)
returns true
. When overriding the equals
or hashCode
methods, it is important to ensure that their behavior is
consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2
), they
should be equal to each other (o1 == o2
) and they should hash to the same value (o1.hashCode == o2.hashCode
).
true
if the argument is a reference to the receiver object; false
otherwise.
The equals method for arbitrary sequences.
Tests whether a predicate holds for some element of this general sequence.
Tests whether a predicate holds for some element of this general sequence.
This method will use abort
signalling capabilities. This means
that splitters may send and read abort
signals.
true if p
holds for some element, false otherwise
Selects all elements of this general sequence which satisfy a predicate.
Selects all elements of this general sequence which satisfy a predicate.
a new general sequence consisting of all elements of this general sequence that satisfy the given
predicate p
. Their order may not be preserved.
Selects all elements of this general sequence which do not satisfy a predicate.
Selects all elements of this general sequence which do not satisfy a predicate.
a new general sequence consisting of all elements of this general sequence that do not satisfy the given
predicate p
. Their order may not be preserved.
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize
method is invoked, as
well as the interaction between finalize
and non-local returns
and exceptions, are all platform dependent.
Finds some element in the collection for which the predicate holds, if such an element exists.
Finds some element in the collection for which the predicate holds, if such an element exists. The element may not necessarily be the first such element in the iteration order.
If there are multiple elements obeying the predicate, the choice is nondeterministic.
This method will use abort
signalling capabilities. This means
that splitters may send and read abort
signals.
an option value with the element if such an element exists, or None
otherwise
[use case] Builds a new collection by applying a function to all elements of this general sequence and concatenating the results.
Builds a new collection by applying a function to all elements of this general sequence and concatenating the results.
the element type of the returned collection.
the function to apply to each element.
a new collection of type That
resulting from applying the given collection-valued function
f
to each element of this general sequence and concatenating the results.
Builds a new collection by applying a function to all elements of this general sequence and concatenating the results.
Builds a new collection by applying a function to all elements of this general sequence and concatenating the results.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the function to apply to each element.
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
resulting from applying the given collection-valued function
f
to each element of this general sequence and concatenating the results.
Folds the elements of this sequence using the specified associative binary operator.
Folds the elements of this sequence using the specified associative binary operator. The order in which the elements are reduced is unspecified and may be nondeterministic.
Note this method has a different signature than the foldLeft
and foldRight
methods of the trait Traversable
.
The result of folding may only be a supertype of this parallel collection's
type parameter T
.
a type parameter for the binary operator, a supertype of T
.
a neutral element for the fold operation, it may be added to the result
an arbitrary number of times, not changing the result (e.g. Nil
for list concatenation,
0 for addition, or 1 for multiplication)
a binary operator that must be associative
the result of applying fold operator op
between all the elements and z
Applies a binary operator to a start value and all elements of this general sequence, going left to right.
Applies a binary operator to a start value and all elements of this general sequence, going left to right.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this general sequence,
going left to right with the start value z
on the left:
op(...op(z, x,,1,,), x,,2,,, ..., x,,n,,)
where x,,1,,, ..., x,,n,,
are the elements of this general sequence.
Applies a binary operator to all elements of this general sequence and a start value, going right to left.
Applies a binary operator to all elements of this general sequence and a start value, going right to left.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this general sequence,
going right to left with the start value z
on the right:
op(x,,1,,, op(x,,2,,, ... op(x,,n,,, z)...))
where x,,1,,, ..., x,,n,,
are the elements of this general sequence.
Tests whether a predicate holds for all elements of this general sequence.
Tests whether a predicate holds for all elements of this general sequence.
This method will use abort
signalling capabilities. This means
that splitters may send and read abort
signals.
true if p
holds for all elements, false otherwise
Applies a function f
to all the elements of general sequence in a sequential order.
Applies a function f
to all the elements of general sequence in a sequential order.
the result type of the function applied to each element, which is always discarded
function applied to each element
A representation that corresponds to the dynamic class of the receiver object.
A representation that corresponds to the dynamic class of the receiver object.
The nature of the representation is platform dependent.
a representation that corresponds to the dynamic class of the receiver object.
Partitions this general sequence into a map of general sequences according to some discriminator function.
Partitions this general sequence into a map of general sequences according to some discriminator function.
Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new general sequence.
the type of keys returned by the discriminator function.
the discriminator function.
A map from keys to general sequences such that the following invariant holds:
(xs partition f)(k) = xs filter (x => f(x) == k)
That is, every key k
is bound to a general sequence of those elements x
for which f(x)
equals k
.
Hashcodes for GenSeq produce a value from the hashcodes of all the elements of the general sequence.
Hashcodes for GenSeq produce a value from the hashcodes of all the elements of the general sequence.
the hash code value for this object.
[use case] Finds index of first occurrence of some value in this general sequence after or at some start index.
Finds index of first occurrence of some value in this general sequence after or at some start index.
the element value to search for.
the start index
the index >= from
of the first element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of first occurrence of some value in this general sequence after or at some start index.
Finds index of first occurrence of some value in this general sequence after or at some start index.
Note: may not terminate for infinite-sized collections.
the type of the element elem
.
the element value to search for.
the start index
the index >= from
of the first element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
[use case] Finds index of first occurrence of some value in this general sequence.
Finds index of first occurrence of some value in this general sequence.
the element value to search for.
the index of the first element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of first occurrence of some value in this general sequence.
Finds index of first occurrence of some value in this general sequence.
Note: may not terminate for infinite-sized collections.
the type of the element elem
.
the element value to search for.
the index of the first element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds the first element satisfying some predicate.
Finds the first element satisfying some predicate.
This method will use indexFlag
signalling capabilities. This means
that splitters may set and read the indexFlag
state.
The index flag is initially set to maximum integer value.
the predicate used to test the elements
the starting offset for the search
the index >= from
of the first element of this general sequence that satisfies the predicate p
,
or -1
, if none exists
Finds index of first element satisfying some predicate.
Finds index of first element satisfying some predicate.
Note: may not terminate for infinite-sized collections.
the predicate used to test elements.
the index of the first element of this general sequence that satisfies the predicate p
,
or -1
, if none exists.
[use case] Computes the multiset intersection between this general sequence and another sequence.
Computes the multiset intersection between this general sequence and another sequence.
Note: may not terminate for infinite-sized collections.
the sequence of elements to intersect with.
a new collection of type That
which contains all elements of this general sequence
which also appear in that
.
If an element value x
appears
n times in that
, then the first n occurrences of x
will be retained
in the result, but any following occurrences will be omitted.
Computes the multiset intersection between this general sequence and another sequence.
Computes the multiset intersection between this general sequence and another sequence.
Note: may not terminate for infinite-sized collections.
the sequence of elements to intersect with.
a new collection of type That
which contains all elements of this general sequence
which also appear in that
.
If an element value x
appears
n times in that
, then the first n occurrences of x
will be retained
in the result, but any following occurrences will be omitted.
Tests whether this general sequence contains given index.
Tests whether this general sequence contains given index.
The implementations of methods apply
and isDefinedAt
turn a Seq[A]
into
a PartialFunction[Int, A]
.
the index to test
true
if this general sequence contains an element at position idx
, false
otherwise.
Tests whether the general sequence is empty.
Tests whether the general sequence is empty.
true
if the general sequence contains no elements, false
otherwise.
Test whether the dynamic type of the receiver object is T0
.
Test whether the dynamic type of the receiver object is T0
.
Note that the result of the test is modulo Scala's erasure semantics.
Therefore the expression 1.isInstanceOf[String]
will return false
, while the
expression List(1).isInstanceOf[List[String]]
will return true
.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the specified type.
true
if the receiver object is an instance of erasure of type T0
; false
otherwise.
Denotes whether this parallel collection has strict splitters.
Denotes whether this parallel collection has strict splitters.
This is true in general, and specific collection instances may choose to
override this method. Such collections will fail to execute methods
which rely on splitters being strict, i.e. returning a correct value
in the remaining
method.
This method helps ensure that such failures occur on method invocations, rather than later on and in unpredictable ways.
Tests whether this general sequence can be repeatedly traversed.
Tests whether this general sequence can be repeatedly traversed.
true
Creates a new split iterator used to traverse the elements of this collection.
Creates a new split iterator used to traverse the elements of this collection.
By default, this method is implemented in terms of the protected splitter
method.
a split iterator
[use case] Finds index of last occurrence of some value in this general sequence before or at a given end index.
Finds index of last occurrence of some value in this general sequence before or at a given end index.
the element value to search for.
the end index.
the index <= end
of the last element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of last occurrence of some value in this general sequence before or at a given end index.
Finds index of last occurrence of some value in this general sequence before or at a given end index.
the type of the element elem
.
the element value to search for.
the end index.
the index <= end
of the last element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
[use case] Finds index of last occurrence of some value in this general sequence.
Finds index of last occurrence of some value in this general sequence.
the element value to search for.
the index of the last element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds index of last occurrence of some value in this general sequence.
Finds index of last occurrence of some value in this general sequence.
Note: will not terminate for infinite-sized collections.
the type of the element elem
.
the element value to search for.
the index of the last element of this general sequence that is equal (wrt ==
)
to elem
, or -1
, if none exists.
Finds the last element satisfying some predicate.
Finds the last element satisfying some predicate.
This method will use indexFlag
signalling capabilities. This means
that splitters may set and read the indexFlag
state.
The index flag is initially set to minimum integer value.
the predicate used to test the elements
the maximum offset for the search
the index <= end
of the first element of this general sequence that satisfies the predicate p
,
or -1
, if none exists
Finds index of last element satisfying some predicate.
Finds index of last element satisfying some predicate.
Note: will not terminate for infinite-sized collections.
the predicate used to test elements.
the index of the last element of this general sequence that satisfies the predicate p
,
or -1
, if none exists.
[use case] Builds a new collection by applying a function to all elements of this general sequence.
Builds a new collection by applying a function to all elements of this general sequence.
the element type of the returned collection.
the function to apply to each element.
a new collection of type That
resulting from applying the given function
f
to each element of this general sequence and collecting the results.
Builds a new collection by applying a function to all elements of this general sequence.
Builds a new collection by applying a function to all elements of this general sequence.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the function to apply to each element.
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
resulting from applying the given function
f
to each element of this general sequence and collecting the results.
[use case] Finds the largest element.
Finds the largest element.
the largest element of this general sequence with respect to the ordering cmp
.
Finds the largest element.
Finds the largest element.
the largest element of this general sequence with respect to the ordering cmp
.
[use case] Finds the smallest element.
Finds the smallest element.
the smallest element of this general sequence with respect to the ordering cmp
.
Finds the smallest element.
Finds the smallest element.
the smallest element of this general sequence with respect to the ordering cmp
.
Displays all elements of this general sequence in a string.
Displays all elements of this general sequence in a string.
a string representation of this general sequence. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this general sequence follow each other without any
separator string.
Displays all elements of this general sequence in a string using a separator string.
Displays all elements of this general sequence in a string using a separator string.
the separator string.
a string representation of this general sequence. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this general sequence are separated by the string sep
.
List(1, 2, 3).mkString("|") = "1|2|3"
Displays all elements of this general sequence in a string using start, end, and separator strings.
Displays all elements of this general sequence in a string using start, end, and separator strings.
the starting string.
the separator string.
the ending string.
a string representation of this general sequence. The resulting string
begins with the string start
and ends with the string
end
. Inside, the string representations (w.r.t. the method
toString
) of all elements of this general sequence are separated by
the string sep
.
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
Equivalent to !(this eq that)
.
Equivalent to !(this eq that)
.
true
if the argument is not a reference to the receiver object; false
otherwise.
Tests whether the general sequence is not empty.
Tests whether the general sequence is not empty.
true
if the general sequence contains at least one element, false
otherwise.
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
[use case] Appends an element value to this general sequence until a given target length is reached.
Appends an element value to this general sequence until a given target length is reached.
the target length
the padding value
a new collection of type That
consisting of
all elements of this general sequence followed by the minimal number of occurrences of elem
so
that the resulting collection has a length of at least len
.
Appends an element value to this general sequence until a given target length is reached.
Appends an element value to this general sequence until a given target length is reached.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the target length
the padding value
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
consisting of
all elements of this general sequence followed by the minimal number of occurrences of elem
so
that the resulting collection has a length of at least len
.
Returns a parallel implementation of this collection.
Returns a parallel implementation of this collection.
For most collection types, this method creates a new parallel collection by copying
all the elements. For these collection, par
takes linear time. Mutable collections
in this category do not produce a mutable parallel collection that has the same
underlying dataset, so changes in one collection will not be reflected in the other one.
Specific collections (e.g. ParArray
or mutable.ParHashMap
) override this default
behaviour by creating a parallel collection which shares the same underlying dataset.
For these collections, par
takes constant or sublinear time.
All parallel collections return a reference to themselves.
a parallel implementation of this collection
The default par
implementation uses the combiner provided by this method
to create a new parallel collection.
The default par
implementation uses the combiner provided by this method
to create a new parallel collection.
a combiner for the parallel collection of type ParRepr
Partitions this general sequence in two general sequences according to a predicate.
Partitions this general sequence in two general sequences according to a predicate.
a pair of general sequences: the first general sequence consists of all elements that
satisfy the predicate p
and the second general sequence consists of all elements
that don't. The relative order of the elements in the resulting general sequences
may not be preserved.
[use case] Produces a new general sequence where a slice of elements in this general sequence is replaced by another sequence.
Produces a new general sequence where a slice of elements in this general sequence is replaced by another sequence.
the index of the first replaced element
the number of elements to drop in the original general sequence
a new general sequence consisting of all elements of this general sequence
except that replaced
elements starting from from
are replaced
by patch
.
Produces a new general sequence where a slice of elements in this general sequence is replaced by another sequence.
Produces a new general sequence where a slice of elements in this general sequence is replaced by another sequence.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the index of the first replaced element
the replacement sequence
the number of elements to drop in the original general sequence
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new general sequence consisting of all elements of this general sequence
except that replaced
elements starting from from
are replaced
by patch
.
Returns the length of the longest prefix whose elements all satisfy some predicate.
Returns the length of the longest prefix whose elements all satisfy some predicate.
Note: may not terminate for infinite-sized collections.
the predicate used to test elements.
the length of the longest prefix of this general sequence
such that every element of the segment satisfies the predicate p
.
[use case] Multiplies up the elements of this collection.
Multiplies up the elements of this collection.
the product of all elements of this general sequence with respect to the *
operator in num
.
Multiplies up the elements of this collection.
Multiplies up the elements of this collection.
an implicit parameter defining a set of numeric operations
which includes the *
operator to be used in forming the product.
the product of all elements of this general sequence with respect to the *
operator in num
.
Reduces the elements of this sequence using the specified associative binary operator.
Reduces the elements of this sequence using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
Note this method has a different signature than the reduceLeft
and reduceRight
methods of the trait Traversable
.
The result of reducing may only be a supertype of this parallel collection's
type parameter T
.
A type parameter for the binary operator, a supertype of T
.
A binary operator that must be associative.
The result of applying reduce operator op
between all the elements if the collection is nonempty.
Optionally applies a binary operator to all elements of this general sequence, going left to right.
Optionally applies a binary operator to all elements of this general sequence, going left to right.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the binary operator.
an option value containing the result of reduceLeft(op)
is this general sequence is nonempty,
None
otherwise.
Optionally reduces the elements of this sequence using the specified associative binary operator.
Optionally reduces the elements of this sequence using the specified associative binary operator.
The order in which operations are performed on elements is unspecified and may be nondeterministic.
Note this method has a different signature than the reduceLeftOption
and reduceRightOption
methods of the trait Traversable
.
The result of reducing may only be a supertype of this parallel collection's
type parameter T
.
A type parameter for the binary operator, a supertype of T
.
A binary operator that must be associative.
An option value containing result of applying reduce operator op
between all
the elements if the collection is nonempty, and None
otherwise.
Applies a binary operator to all elements of this general sequence, going right to left.
Applies a binary operator to all elements of this general sequence, going right to left.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the binary operator.
the result of inserting op
between consecutive elements of this general sequence,
going right to left:
op(x,,1,,, op(x,,2,,, ..., op(x,,n-1,,, x,,n,,)...))
where x,,1,,, ..., x,,n,,
are the elements of this general sequence.
Optionally applies a binary operator to all elements of this general sequence, going right to left.
Optionally applies a binary operator to all elements of this general sequence, going right to left.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.
the binary operator.
an option value containing the result of reduceRight(op)
is this general sequence is nonempty,
None
otherwise.
Optionally reuses an existing combiner for better performance.
Optionally reuses an existing combiner for better performance. By default it doesn't - subclasses may override this behaviour.
The provided combiner oldc
that can potentially be reused will be either some combiner from the previous computational task, or None
if there
was no previous phase (in which case this method must return newc
).
The combiner that is the result of the previous task, or None
if there was no previous task.
The new, empty combiner that can be used.
Either newc
or oldc
.
Returns new general sequence wih elements in reversed order.
Returns new general sequence wih elements in reversed order.
Note: will not terminate for infinite-sized collections.
A new general sequence with all elements of this general sequence in reversed order.
[use case] Builds a new collection by applying a function to all elements of this general sequence and collecting the results in reversed order.
Builds a new collection by applying a function to all elements of this general sequence and collecting the results in reversed order.
the element type of the returned collection.
the function to apply to each element.
a new collection of type That
resulting from applying the given function
f
to each element of this general sequence and collecting the results in reversed order.
Note: xs.reverseMap(f)
is the same as xs.reverse.map(f)
but might be more efficient.
Builds a new collection by applying a function to all elements of this general sequence and collecting the results in reversed order.
Builds a new collection by applying a function to all elements of this general sequence and collecting the results in reversed order.
Note: will not terminate for infinite-sized collections.
Note: xs.reverseMap(f)
is the same as xs.reverse.map(f)
but might be more efficient.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the function to apply to each element.
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
resulting from applying the given function
f
to each element of this general sequence and collecting the results in reversed order.
[use case] Checks if the other iterable collection contains the same elements in the same order as this general sequence.
Checks if the other iterable collection contains the same elements in the same order as this general sequence.
the collection to compare with.
true
, if both collections contain the same elements in the same order, false
otherwise.
Checks if the other iterable collection contains the same elements in the same order as this general sequence.
Checks if the other iterable collection contains the same elements in the same order as this general sequence.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Note: will not terminate for infinite-sized collections.
the collection to compare with.
true
, if both collections contain the same elements in the same order, false
otherwise.
[use case] Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
neutral element for the operator op
the associative operator for the scan
a collection containing the prefix scan of the elements in the original collection
Computes a prefix scan of the elements of the collection.
Computes a prefix scan of the elements of the collection.
Note: The neutral element z
may be applied more than once.
element type of the resulting collection
type of the resulting collection
neutral element for the operator op
the associative operator for the scan
a collection containing the prefix scan of the elements in the original collection
Produces a collection containing cummulative results of applying the operator going left to right.
Produces a collection containing cummulative results of applying the operator going left to right.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the actual type of the resulting collection
the initial value
the binary operator applied to the intermediate result and the element
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
collection with intermediate results
Produces a collection containing cummulative results of applying the operator going right to left.
Produces a collection containing cummulative results of applying the operator going right to left. The head of the collection is the last cummulative result.
Note: will not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Example:
List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)
the actual type of the resulting collection
the initial value
the binary operator applied to the intermediate result and the element
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
collection with intermediate results
Returns the length of the longest segment of elements starting at a given position satisfying some predicate.
Returns the length of the longest segment of elements starting at a given position satisfying some predicate.
This method will use indexFlag
signalling capabilities. This means
that splitters may set and read the indexFlag
state.
The index flag is initially set to maximum integer value.
the predicate used to test the elements
the starting offset for the search
the length of the longest segment of elements starting at from
and
satisfying the predicate
The size of this general sequence.
The size of this general sequence.
Note: will not terminate for infinite-sized collections.
the number of elements in this general sequence.
Selects an interval of elements.
Selects an interval of elements. The returned collection is made up
of all elements x
which satisfy the invariant:
from <= indexOf(x) < until
Note: might return different results for different runs, unless the underlying collection type is ordered.
a general sequence containing the elements greater than or equal to
index from
extending up to (but not including) index until
of this general sequence.
Splits this general sequence into a prefix/suffix pair according to a predicate.
Splits this general sequence into a prefix/suffix pair according to a predicate.
This method will use indexFlag
signalling capabilities. This means
that splitters may set and read the indexFlag
state.
The index flag is initially set to maximum integer value.
the predicate used to test the elements
a pair consisting of the longest prefix of the collection for which all
the elements satisfy pred
, and the rest of the collection
Splits this general sequence into two at a given position.
Splits this general sequence into two at a given position.
Note: c splitAt n
is equivalent to (but possibly more efficient than)
(c take n, c drop n)
.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the position at which to split.
a pair of general sequences consisting of the first n
elements of this general sequence, and the other elements.
Tests whether this general sequence contains the given sequence at a given index.
Tests whether this general sequence contains the given sequence at a given index.
This method will use abort
signalling capabilities. This means
that splitters may send and read abort
signals.
the parallel sequence this sequence is being searched for
the starting offset for the search
true
if there is a sequence that
starting at offset
in this sequence, false
otherwise
Tests whether this general sequence starts with the given sequence.
Tests whether this general sequence starts with the given sequence.
the sequence to test
true
if this collection has that
as a prefix, false
otherwise.
[use case] Sums up the elements of this collection.
Sums up the elements of this collection.
the sum of all elements of this general sequence with respect to the +
operator in num
.
Sums up the elements of this collection.
Sums up the elements of this collection.
an implicit parameter defining a set of numeric operations
which includes the +
operator to be used in forming the sum.
the sum of all elements of this general sequence with respect to the +
operator in num
.
Selects all elements except the first.
Selects all elements except the first.
Note: might return different results for different runs, unless the underlying collection type is ordered.
a general sequence consisting of all elements of this general sequence except the first one.
Selects first n elements.
Selects first n elements.
Note: might return different results for different runs, unless the underlying collection type is ordered.
Tt number of elements to take from this general sequence.
a general sequence consisting only of the first n
elements of this general sequence,
or else the whole general sequence, if it has less than n
elements.
Takes the longest prefix of elements that satisfy the predicate.
Takes the longest prefix of elements that satisfy the predicate.
This method will use indexFlag
signalling capabilities. This means
that splitters may set and read the indexFlag
state.
The index flag is initially set to maximum integer value.
the predicate used to test the elements
the longest prefix of this general sequence of elements that satisy the predicate pred
Some minimal number of elements after which this collection should be handled sequentially by different processors.
Some minimal number of elements after which this collection should be handled sequentially by different processors.
This method depends on the size of the collection and the parallelism level, which are both specified as arguments.
the size based on which to compute the threshold
the parallelism level based on which to compute the threshold
the maximum number of elements for performing operations sequentially
[use case] Converts this general sequence to an array.
Converts this general sequence to an array.
Note: will not terminate for infinite-sized collections.
an array containing all elements of this general sequence.
Converts this general sequence to an array.
Converts this general sequence to an array.
Note: will not terminate for infinite-sized collections.
an array containing all elements of this general sequence.
Converts this general sequence to a mutable buffer.
Converts this general sequence to a mutable buffer.
Note: will not terminate for infinite-sized collections.
a buffer containing all elements of this general sequence.
Converts this general sequence to an indexed sequence.
Converts this general sequence to an indexed sequence.
Note: will not terminate for infinite-sized collections.
an indexed sequence containing all elements of this general sequence.
Converts this general sequence to an iterable collection.
Converts this general sequence to an iterable collection. Note that
the choice of target Iterable
is lazy in this default implementation
as this TraversableOnce
may be lazy and unevaluated (i.e. it may
be an iterator which is only traversable once).
Note: will not terminate for infinite-sized collections.
an Iterable
containing all elements of this general sequence.
Returns an Iterator over the elements in this general sequence.
Returns an Iterator over the elements in this general sequence. Will return the same Iterator if this instance is already an Iterator.
Note: will not terminate for infinite-sized collections.
an Iterator containing all elements of this general sequence.
Converts this general sequence to a list.
Converts this general sequence to a list.
Note: will not terminate for infinite-sized collections.
a list containing all elements of this general sequence.
[use case] Converts this general sequence to a map.
Converts this general sequence to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.
Note: will not terminate for infinite-sized collections.
a map containing all elements of this general sequence.
Converts this general sequence to a map.
Converts this general sequence to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.
Note: will not terminate for infinite-sized collections.
a map containing all elements of this general sequence.
Converts this general sequence to a sequence.
Converts this general sequence to a sequence. As with toIterable
, it's lazy
in this default implementation, as this TraversableOnce
may be
lazy and unevaluated.
Note: will not terminate for infinite-sized collections.
a sequence containing all elements of this general sequence.
Converts this general sequence to a set.
Converts this general sequence to a set.
Note: will not terminate for infinite-sized collections.
a set containing all elements of this general sequence.
Converts this general sequence to a stream.
Converts this general sequence to a stream.
Note: will not terminate for infinite-sized collections.
a stream containing all elements of this general sequence.
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
a String representation of the object.
Converts this general sequence to an unspecified Traversable.
Converts this general sequence to an unspecified Traversable. Will return the same collection if this instance is already Traversable.
Note: will not terminate for infinite-sized collections.
a Traversable containing all elements of this general sequence.
[use case] Produces a new sequence which contains all elements of this general sequence and also all elements of a given sequence.
Produces a new sequence which contains all elements of this general sequence and also all elements of
a given sequence. xs union ys
is equivalent to xs ++ ys
.
Note: will not terminate for infinite-sized collections.
the sequence to add.
a new collection of type That
which contains all elements of this general sequence
followed by all elements of that
.
Produces a new sequence which contains all elements of this general sequence and also all elements of a given sequence.
Produces a new sequence which contains all elements of this general sequence and also all elements of
a given sequence. xs union ys
is equivalent to xs ++ ys
.
Note: will not terminate for infinite-sized collections.
Another way to express this
is that xs union ys
computes the order-presevring multi-set union of xs
and ys
.
union
is hence a counter-part of diff
and intersect
which also work on multi-sets.
Note: will not terminate for infinite-sized collections.
the element type of the returned general sequence.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the sequence to add.
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new collection of type That
which contains all elements of this general sequence
followed by all elements of that
.
[use case] A copy of this general sequence with one single replaced element.
A copy of this general sequence with one single replaced element.
the position of the replacement
the replacing element
a new general sequence which is a copy of this general sequence with the element at position
index replaced by
elem.
A copy of this general sequence with one single replaced element.
A copy of this general sequence with one single replaced element.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type B
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, B, That]
is found.
the position of the replacement
the replacing element
an implicit value of class CanBuildFrom
which determines
the result class That
from the current representation type Repr
and
and the new element type B
.
a new general sequence which is a copy of this general sequence with the element at position
index replaced by
elem.
[use case] Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs.
Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.
the type of the second half of the returned pairs
The iterable providing the second half of each result pair
a new collection of type That
containing pairs consisting of
corresponding elements of this general sequence and that
. The length
of the returned collection is the minimum of the lengths of this general sequence and that
.
Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs.
Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type (A1, B)
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, (A1, B), That]
.
is found.
The iterable providing the second half of each result pair
an implicit value of class CanBuildFrom
which determines the
result class That
from the current representation type Repr
and the new element type (A1, B)
.
a new collection of type That
containing pairs consisting of
corresponding elements of this general sequence and that
. The length
of the returned collection is the minimum of the lengths of this general sequence and that
.
[use case] Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs.
Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.
the iterable providing the second half of each result pair
the element to be used to fill up the result if this general sequence is shorter than that
.
the element to be used to fill up the result if that
is shorter than this general sequence.
a new collection of type That
containing pairs consisting of
corresponding elements of this general sequence and that
. The length
of the returned collection is the maximum of the lengths of this general sequence and that
.
If this general sequence is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this general sequence, thatElem
values are used to pad the result.
Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs.
Returns a general sequence formed from this general sequence and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the iterable providing the second half of each result pair
the element to be used to fill up the result if this general sequence is shorter than that
.
the element to be used to fill up the result if that
is shorter than this general sequence.
a new collection of type That
containing pairs consisting of
corresponding elements of this general sequence and that
. The length
of the returned collection is the maximum of the lengths of this general sequence and that
.
If this general sequence is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this general sequence, thatElem
values are used to pad the result.
[use case] Zips this general sequence with its indices.
Zips this general sequence with its indices.
A new collection of type That
containing pairs consisting of all elements of this
general sequence paired with their index. Indices start at 0
.
Zips this general sequence with its indices.
Zips this general sequence with its indices.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the class of the returned collection. Where possible, That
is
the same class as the current collection class Repr
, but this
depends on the element type (A1, Int)
being admissible for that class,
which means that an implicit instance of type CanBuildFrom[Repr, (A1, Int), That]
.
is found.
A new collection of type That
containing pairs consisting of all elements of this
general sequence paired with their index. Indices start at 0
.
A template trait for sequences of type
ParSeq[T]
, representing parallel sequences with element typeT
.Parallel sequences inherit the
Seq
trait. Their indexing and length computations are defined to be efficient. Like their sequential counterparts they always have a defined order of elements. This means they will produce resulting parallel sequences in the same way sequential sequences do. However, the order in which they perform bulk operations on elements to produce results is not defined and is generally nondeterministic. If the higher-order functions given to them produce no sideeffects, then this won't be noticeable.This trait defines a new, more general
split
operation and reimplements thesplit
operation ofParallelIterable
trait using the newsplit
operation.the type of the elements contained in this collection
the type of the actual collection containing the elements
the type of the sequential version of this parallel collection