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 and null
.
Equivalent to x.hashCode
except for boxed numeric types and null
.
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.
For null
returns a hashcode where null.hashCode
throws a
NullPointerException
.
a hash value consistent with ==
Test two objects for equality.
Test two objects for equality.
The expression x == that
is equivalent to if (x eq null) that eq null else x.equals(that)
.
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.
if the receiver object is not an instance of the erasure of type T0
.
Create a copy of the receiver object.
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.
Returns false
if Right
or returns the result of the application of
the given function to the Left
value.
Returns false
if Right
or returns the result of the application of
the given function to the Left
value.
Left(12).left.exists(_ > 10) // true Left(7).left.exists(_ > 10) // false Right(12).left.exists(_ > 10) // false
Returns None
if this is a Right
or if the given predicate
p
does not hold for the left value, otherwise, returns a Left
.
Returns None
if this is a Right
or if the given predicate
p
does not hold for the left value, otherwise, returns a Left
.
Left(12).left.filter(_ > 10) // Some(Left(12)) Left(7).left.filter(_ > 10) // None Right(12).left.filter(_ > 10) // None
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.
Binds the given function across Left
.
Binds the given function across Left
.
Left(12).left.flatMap(x => Left("scala")) // Left("scala") Right(12).left.flatMap(x => Left("scala") // Right(12)
The function to bind across Left
.
Returns true
if Right
or returns the result of the application of
the given function to the Left
value.
Returns true
if Right
or returns the result of the application of
the given function to the Left
value.
Left(12).left.forall(_ > 10) // true Left(7).left.forall(_ > 10) // false Right(12).left.forall(_ > 10) // true
Executes the given side-effecting function if this is a Left
.
Executes the given side-effecting function if this is a Left
.
Left(12).left.foreach(x => println(x)) // prints "12" Right(12).left.foreach(x => println(x)) // doesn't print
The side-effecting function to execute.
Returns string formatted according to given format
string.
Returns string formatted according to given format
string.
Format strings are as for String.format
(@see java.lang.String.format).
Returns the value from this Left
or throws Predef.NoSuchElementException
if this is a Right
.
Returns the value from this Left
or throws Predef.NoSuchElementException
if this is a Right
.
Left(12).left.get // 12 Right(12).left.get // NoSuchElementException
if the projection is scala.util.Right
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.
not specified by SLS as a member of AnyRef
Returns the value from this Left
or the given argument if this is a
Right
.
Returns the value from this Left
or the given argument if this is a
Right
.
Left(12).left.getOrElse(17) // 12 Right(12).left.getOrElse(17) // 17
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.
Maps the function argument through Left
.
Maps the function argument through Left
.
Left(12).left.map(_ + 2) // Left(14) Right[Int, Int](12).left.map(_ + 2) // Right(12)
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.
not specified by SLS as a member of AnyRef
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.
not specified by SLS as a member of AnyRef
Returns a Some
containing the Left
value if it exists or a
None
if this is a Right
.
Returns a Some
containing the Left
value if it exists or a
None
if this is a Right
.
Left(12).left.toOption // Some(12) Right(12).left.toOption // None
Returns a Seq
containing the Left
value if it exists or an empty
Seq
if this is a Right
.
Returns a Seq
containing the Left
value if it exists or an empty
Seq
if this is a Right
.
Left(12).left.toSeq // Seq(12) Right(12).left.toSeq // Seq()
(leftProjection: StringAdd).self
(leftProjection: StringFormat).self
(leftProjection: ArrowAssoc[LeftProjection[A, B]]).x
(Since version 2.10.0) Use leftOfArrow
instead
(leftProjection: Ensuring[LeftProjection[A, B]]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
Projects an
Either
into aLeft
.This allows for-comprehensions over Either instances - for example
Continuing the analogy with scala.Option, a
LeftProjection
declares thatLeft
should be analogous toSome
in some code.1.0, 11/10/2008