Concatenates this general iterable collection with the elements of a traversable collection.
Concatenates this general iterable collection with the elements of a traversable collection.
the element type of the returned 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 iterable collection
followed by all elements of that
.
Applies a binary operator to a start value and all elements of this general iterable collection , going left to right.
Applies a binary operator to a start value and all elements of this general iterable collection , 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 result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this general iterable collection
,
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 iterable collection
.
Applies a binary operator to all elements of this general iterable collection and a start value, going right to left.
Applies a binary operator to all elements of this general iterable collection 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 result type of the binary operator.
the start value
the binary operator
the result of inserting op
between consecutive elements of this general iterable collection
,
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 iterable collection
.
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 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
Builds a new collection by applying a partial function to all elements of this general iterable collection
Builds a new collection by applying a partial function to all elements of this general iterable collection
on which the function is defined.
the element type of the returned 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 partial function which filters and maps the general iterable collection .
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.
Copies values of this general iterable collection to an array.
Copies values of this general iterable collection
to an array.
Fills the given array xs
with values of this general iterable collection
, beginning at index start
.
Copying will stop once either the end of the current general iterable collection
is reached,
or the end of the array is reached.
Note: will not terminate for infinite-sized collections.
the type of the elements of the array.
the array to fill.
the starting index.
Copies values of this general iterable collection to an array.
Copies values of this general iterable collection
to an array.
Fills the given array xs
with values of this general iterable collection
.
Copying will stop once either the end of the current general iterable collection
is reached,
or the end of the array is reached.
Note: will not terminate for infinite-sized collections.
the type of the elements of the array.
the array to fill.
Counts the number of elements in the general iterable collection which satisfy a predicate.
Counts the number of elements in the general iterable collection which satisfy a predicate.
the predicate used to test elements.
the number of elements satisfying the predicate p
.
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 iterable collection .
a general iterable collection
consisting of all elements of this general iterable collection
except the first n
ones, or else the
empty general iterable collection
, if this general iterable collection
has less than n
elements.
Drops longest prefix of elements that satisfy a predicate.
Drops longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the longest suffix of this general iterable collection
whose first element
does not satisfy the predicate p
.
Selects all elements of this general iterable collection which satisfy a predicate.
Selects all elements of this general iterable collection which satisfy a predicate.
a new general iterable collection
consisting of all elements of this general iterable collection
that satisfy the given
predicate p
. Their order may not be preserved.
Selects all elements of this general iterable collection which do not satisfy a predicate.
Selects all elements of this general iterable collection which do not satisfy a predicate.
a new general iterable collection
consisting of all elements of this general iterable collection
that do not satisfy the given
predicate p
. Their order may not be preserved.
Finds the first element of the general iterable collection satisfying a predicate, if any.
Finds the first element of the general iterable collection satisfying a predicate, if any.
Note: may not terminate for infinite-sized collections.
Note: might return different results for different runs, unless the underlying collection type is ordered.
an option value containing the first element in the general iterable collection
that satisfies p
, or None
if none exists.
Builds a new collection by applying a function to all elements of this general iterable collection
Builds a new collection by applying a function to all elements of this general iterable collection
and concatenating the results.
the element type of the returned 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 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 iterable collection
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 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 iterable collection , going left to right.
Applies a binary operator to a start value and all elements of this general iterable collection , 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 result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this general iterable collection
,
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 iterable collection
.
Applies a binary operator to all elements of this general iterable collection and a start value, going right to left.
Applies a binary operator to all elements of this general iterable collection 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 result type of the binary operator.
the start value.
the binary operator.
the result of inserting op
between consecutive elements of this general iterable collection
,
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 iterable collection
.
Applies a function f
to all elements of this general iterable collection
.
Applies a function f
to all elements of this general iterable collection
.
the type parameter describing the result of function f
.
This result will always be ignored. Typically U
is Unit
,
but this is not necessary.
the function that is applied for its side-effect to every element.
The result of function f
is discarded.
Partitions this general iterable collection into a map of general iterable collection s according to some discriminator function.
Partitions this general iterable collection into a map of general iterable collection s 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 iterable collection .
the type of keys returned by the discriminator function.
the discriminator function.
A map from keys to general iterable collection s 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 iterable collection
of those elements x
for which f(x)
equals k
.
Builds a new collection by applying a function to all elements of this general iterable collection .
Builds a new collection by applying a function to all elements of this general iterable collection .
the element type of the returned 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 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 iterable collection
and collecting the results.
Finds the largest element.
Finds the largest element.
the largest element of this general iterable collection
with respect to the ordering cmp
.
Finds the smallest element.
Finds the smallest element.
the smallest element of this general iterable collection
with respect to the ordering cmp
.
Displays all elements of this general iterable collection in a string.
Displays all elements of this general iterable collection in a string.
a string representation of this general iterable collection
. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this general iterable collection
follow each other without any
separator string.
Displays all elements of this general iterable collection in a string using a separator string.
Displays all elements of this general iterable collection in a string using a separator string.
the separator string.
a string representation of this general iterable collection
. In the resulting string
the string representations (w.r.t. the method toString
)
of all elements of this general iterable collection
are separated by the string sep
.
List(1, 2, 3).mkString("|") = "1|2|3"
Displays all elements of this general iterable collection in a string using start, end, and separator strings.
Displays all elements of this general iterable collection in a string using start, end, and separator strings.
the starting string.
the separator string.
the ending string.
a string representation of this general iterable collection
. 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 iterable collection
are separated by
the string sep
.
List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"
Tests whether the general iterable collection is not empty.
Tests whether the general iterable collection is not empty.
true
if the general iterable collection
contains at least one element, false
otherwise.
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 iterable collection in two general iterable collection s according to a predicate.
Partitions this general iterable collection in two general iterable collection s according to a predicate.
a pair of general iterable collection
s: the first general iterable collection
consists of all elements that
satisfy the predicate p
and the second general iterable collection
consists of all elements
that don't. The relative order of the elements in the resulting general iterable collection
s
may not be preserved.
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 iterable collection
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 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 iterable collection , going left to right.
Optionally applies a binary operator to all elements of this general iterable collection , 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 result type of the binary operator.
the binary operator.
an option value containing the result of reduceLeft(op)
is this general iterable collection
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 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 iterable collection , going right to left.
Applies a binary operator to all elements of this general iterable collection , 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 result type of the binary operator.
the binary operator.
the result of inserting op
between consecutive elements of this general iterable collection
,
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 iterable collection
.
Optionally applies a binary operator to all elements of this general iterable collection , going right to left.
Optionally applies a binary operator to all elements of this general iterable collection , 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 result type of the binary operator.
the binary operator.
an option value containing the result of reduceRight(op)
is this general iterable collection
is nonempty,
None
otherwise.
Checks if the other iterable collection contains the same elements in the same order as this general iterable collection .
Checks if the other iterable collection contains the same elements in the same order as this general iterable collection .
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.
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
combiner factory which provides a combiner
a new general iterable collection containing the prefix scan of the elements in this general iterable 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 type of the elements in the resulting collection
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 type of the elements in the resulting collection
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
"This scanRight definition has changed in 2.9.\n" + "The previous behavior can be reproduced with scanRight.reverse."
The size of this general iterable collection .
The size of this general iterable collection .
Note: will not terminate for infinite-sized collections.
the number of elements in this general iterable collection .
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 iterable collection
containing the elements greater than or equal to
index from
extending up to (but not including) index until
of this general iterable collection
.
Splits this general iterable collection into a prefix/suffix pair according to a predicate.
Splits this general iterable collection into a prefix/suffix pair according to a predicate.
Note: c span p
is equivalent to (but possibly more efficient than)
(c takeWhile p, c dropWhile p)
, provided the evaluation of the
predicate p
does not cause any side-effects.
Note: might return different results for different runs, unless the underlying collection type is ordered.
a pair consisting of the longest prefix of this general iterable collection
whose
elements all satisfy p
, and the rest of this general iterable collection
.
Splits this general iterable collection into two at a given position.
Splits this general iterable collection
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 iterable collection
s consisting of the first n
elements of this general iterable collection
, and the other elements.
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 iterable collection
. By default the string prefix is the
simple name of the collection class general iterable collection
.
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 iterable collection
with respect to the +
operator in num
.
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 iterable collection .
a general iterable collection
consisting only of the first n
elements of this general iterable collection
,
or else the whole general iterable collection
, if it has less than n
elements.
Takes longest prefix of elements that satisfy a predicate.
Takes longest prefix of elements that satisfy a predicate.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the longest prefix of this general iterable collection
whose elements all satisfy
the predicate p
.
Converts this general iterable collection to an array.
Converts this general iterable collection to an array.
Note: will not terminate for infinite-sized collections.
an array containing all elements of this general iterable collection .
Converts this general iterable collection to a mutable buffer.
Converts this general iterable collection to a mutable buffer.
Note: will not terminate for infinite-sized collections.
a buffer containing all elements of this general iterable collection .
Converts this general iterable collection to an indexed sequence.
Converts this general iterable collection to an indexed sequence.
Note: will not terminate for infinite-sized collections.
an indexed sequence containing all elements of this general iterable collection .
Converts this general iterable collection to an iterable collection.
Converts this general iterable collection
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 iterable collection
.
Returns an Iterator over the elements in this general iterable collection .
Returns an Iterator over the elements in this general iterable collection . 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 iterable collection .
Converts this general iterable collection to a list.
Converts this general iterable collection to a list.
Note: will not terminate for infinite-sized collections.
a list containing all elements of this general iterable collection .
Converts this general iterable collection to a map.
Converts this general iterable collection 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 iterable collection .
Converts this general iterable collection to a sequence.
Converts this general iterable collection
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 iterable collection .
Converts this general iterable collection to a set.
Converts this general iterable collection to a set.
Note: will not terminate for infinite-sized collections.
a set containing all elements of this general iterable collection .
Converts this general iterable collection to a stream.
Converts this general iterable collection to a stream.
Note: will not terminate for infinite-sized collections.
a stream containing all elements of this general iterable collection .
Converts this general iterable collection to an unspecified Traversable.
Converts this general iterable collection 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 iterable collection .
Returns a general iterable collection formed from this general iterable collection and another iterable collection by combining corresponding elements in pairs.
Returns a general iterable collection formed from this general iterable collection 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 type of the first half of the returned pairs (this is always a supertype
of the collection's element type A
).
the type of the second half of the returned pairs
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 iterable collection
and that
. The length
of the returned collection is the minimum of the lengths of this general iterable collection
and that
.
Returns a general iterable collection formed from this general iterable collection and another iterable collection by combining corresponding elements in pairs.
Returns a general iterable collection formed from this general iterable collection 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 iterable collection
is shorter than that
.
the element to be used to fill up the result if that
is shorter than this general iterable collection
.
a new collection of type That
containing pairs consisting of
corresponding elements of this general iterable collection
and that
. The length
of the returned collection is the maximum of the lengths of this general iterable collection
and that
.
If this general iterable collection
is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this general iterable collection
, thatElem
values are used to pad the result.
Zips this general iterable collection with its indices.
Zips this general iterable collection with its indices.
Note: might return different results for different runs, unless the underlying collection type is ordered.
the type of the first half of the returned pairs (this is always a supertype
of the collection's element type A
).
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 iterable collection
paired with their index. Indices start at 0
.
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 iterable collection with the elements of a traversable collection.
Concatenates this general iterable collection 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 iterable collection
followed by all elements of that
.
A syntactic sugar for out of order folding.
A syntactic sugar for out of order folding. See fold
.
Test two objects for equality.
Test two objects for equality.
true
if the receiver object is equivalent to the argument; false
otherwise.
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 iterable collection
Builds a new collection by applying a partial function to all elements of this general iterable collection
on which the function is defined.
the element type of the returned collection.
the partial function which filters and maps the general iterable collection .
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 iterable collection to an array.
Copies values of this general iterable collection
to an array.
Fills the given array xs
with values of this general iterable collection
, beginning at index start
.
Copying will stop once either the end of the current general iterable collection
is reached,
or the end of the array is reached.
the array to fill.
the starting index.
[use case] Copies values of this general iterable collection to an array.
Copies values of this general iterable collection
to an array.
Fills the given array xs
with values of this general iterable collection
.
Copying will stop once either the end of the current general iterable collection
is reached,
or the end of the array is reached.
the array to fill.
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 equality method for reference types.
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.
[use case] Builds a new collection by applying a function to all elements of this general iterable collection
Builds a new collection by applying a function to all elements of this general iterable collection
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 iterable collection
and concatenating the results.
[use case] Applies a function f
to all elements of this general iterable collection
.
Applies a function f
to all elements of this general iterable collection
.
the function that is applied for its side-effect to every element.
The result of function f
is discarded.
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.
The hashCode method for reference types.
Tests whether the general iterable collection is empty.
Tests whether the general iterable collection is empty.
true
if the general iterable collection
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.
Tests whether this general iterable collection can be repeatedly traversed.
Tests whether this general iterable collection can be repeatedly traversed.
true
[use case] Builds a new collection by applying a function to all elements of this general iterable collection .
Builds a new collection by applying a function to all elements of this general iterable collection .
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 iterable collection
and collecting the results.
[use case] Finds the largest element.
Finds the largest element.
the largest element of this general iterable collection
with respect to the ordering cmp
.
[use case] Finds the smallest element.
Finds the smallest element.
the smallest element of this general iterable collection
with respect to the ordering cmp
.
Equivalent to !(this eq that)
.
Equivalent to !(this eq that)
.
true
if the argument is not a reference to the receiver object; 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.
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
[use case] Multiplies up the elements of this collection.
Multiplies up the elements of this collection.
the product of all elements of this general iterable collection
with respect to the *
operator in num
.
[use case] Checks if the other iterable collection contains the same elements in the same order as this general iterable collection .
Checks if the other iterable collection contains the same elements in the same order as this general iterable collection .
the collection to compare with.
true
, if both collections contain the same elements in the same order, 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 iterable collection
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 iterable collection consisting of all elements of this general iterable collection
except the first one.
[use case] Converts this general iterable collection to an array.
Converts this general iterable collection to an array.
Note: will not terminate for infinite-sized collections.
an array containing all elements of this general iterable collection .
[use case] Converts this general iterable collection to a map.
Converts this general iterable collection 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 iterable collection .
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.
[use case] Returns a general iterable collection formed from this general iterable collection and another iterable collection by combining corresponding elements in pairs.
Returns a general iterable collection formed from this general iterable collection 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 iterable collection
and that
. The length
of the returned collection is the minimum of the lengths of this general iterable collection
and that
.
[use case] Returns a general iterable collection formed from this general iterable collection and another iterable collection by combining corresponding elements in pairs.
Returns a general iterable collection formed from this general iterable collection 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 iterable collection
is shorter than that
.
the element to be used to fill up the result if that
is shorter than this general iterable collection
.
a new collection of type That
containing pairs consisting of
corresponding elements of this general iterable collection
and that
. The length
of the returned collection is the maximum of the lengths of this general iterable collection
and that
.
If this general iterable collection
is shorter than that
, thisElem
values are used to pad the result.
If that
is shorter than this general iterable collection
, thatElem
values are used to pad the result.
[use case] Zips this general iterable collection with its indices.
Zips this general iterable collection with its indices.
A new collection of type That
containing pairs consisting of all elements of this
general iterable collection
paired with their index. Indices start at 0
.
A template trait for all iterable collections which may possibly have their operations implemented in parallel.
This trait contains abstract methods and methods that can be implemented directly in terms of other methods.