Scala Library
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scala/None.scala
]
case
object
None
extends
Option[Nothing]Method Summary | |
override def
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canEqual
(arg0 : Any) : Boolean
An equality helper method to assist in maintaining reflexivity
in the face of subtyping. For more, see
http://www.artima.com/lejava/articles/equality.html
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def
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get
: Nothing
get the value of this option.
@requires that the option is nonEmpty.
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def
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isEmpty
: Boolean
True if the option is the
None value, false otherwise. |
override def
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productArity
: Int
return k for a product
A(x_1,...,x_k) |
override def
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productElement
(arg0 : Int) : Any
for a product
A(x_1,...,x_k) , returns x_(n+1)
for 0 <= n < k |
override def
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productPrefix
: java.lang.String
By default the empty string. Implementations may override this
method in order to prepend a string prefix to the result of the
toString methods.
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protected def
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readResolve : AnyRef |
override final def
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toString
: java.lang.String
Returns a string representation of the object.
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Methods inherited from Option | |
isDefined, get, getOrElse, map, flatMap, filter, foreach, filterMap, orElse, iterator, toList, toRight, toLeft |
Methods inherited from Product | |
productIterator, productElements |
Methods inherited from AnyRef | |
getClass, hashCode, equals, clone, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized |
Methods inherited from Any | |
==, !=, isInstanceOf, asInstanceOf |
Method Details |
def
isEmpty : Boolean
None
value, false otherwise.
def
get : Nothing
override final
def
toString : java.lang.String
The default representation is platform dependent.
override
def
productPrefix : java.lang.String
override
def
productArity : Int
A(x_1,...,x_k)
A(x_1,...,x_k)
, returns x_(n+1)
for 0 <= n < k
n -
the index of the element to returnIndexOutOfBoundsException -
n
elements after the first elementprotected
def
readResolve : AnyRef
Scala Library
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