Some (original) (raw)
We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.
We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.
Attributes
Inherited from:
Source
Supertypes
Returns the option's value.
Returns the option's value.
This is equivalent to:
option match {
case Some(x) => x
case None => throw new Exception
}
Attributes
Throws
Note
The option must be nonempty.
Source
Returns a scala.Some containing the result of applying pf to this scala.Option's contained value, if this option is nonempty and pf is defined for that value.
Returns a scala.Some containing the result of applying pf to this scala.Option's contained value, if this option is nonempty and pf is defined for that value. Returns None otherwise.
Value parameters
pf
the partial function.
Attributes
Returns
the result of applying pf to this scala.Option's value (if possible), or None.
Example
// Returns Some(HTTP) because the partial function covers the case.
Some("http") collect {case "http" => "HTTP"}
// Returns None because the partial function doesn't cover the case.
Some("ftp") collect {case "http" => "HTTP"}
// Returns None because the option is empty. There is no value to pass to the partial function.
None collect {case value => value}
Inherited from:
Source
Tests whether the option contains a given value as an element.
Tests whether the option contains a given value as an element.
This is equivalent to:
option match {
case Some(x) => x == elem
case None => false
}
Value parameters
elem
the element to test.
Attributes
Returns
true if the option has an element that is equal (as determined by ==) to elem, false otherwise.
Example
// Returns true because Some instance contains string "something" which equals "something".
Some("something") contains "something"
// Returns false because "something" != "anything".
Some("something") contains "anything"
// Returns false when method called on None.
None contains "anything"
Inherited from:
Source
Returns true if this option is nonempty and the predicate p returns true when applied to this scala.Option's value.
Returns true if this option is nonempty and the predicate p returns true when applied to this scala.Option's value. Otherwise, returns false.
This is equivalent to:
option match {
case Some(x) => p(x)
case None => false
}
Value parameters
p
the predicate to test
Attributes
Inherited from:
Source
Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns true.
Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns true. Otherwise, return None.
This is equivalent to:
option match {
case Some(x) if p(x) => Some(x)
case _ => None
}
Value parameters
p
the predicate used for testing.
Attributes
Inherited from:
Source
Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns false.
Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns false. Otherwise, return None.
This is equivalent to:
option match {
case Some(x) if !p(x) => Some(x)
case _ => None
}
Value parameters
p
the predicate used for testing.
Attributes
Inherited from:
Source
Returns the result of applying f to this scala.Option's value if this scala.Option is nonempty. Returns None if this scala.Option is empty. Slightly different from map in that f is expected to return an scala.Option (which could be None).
This is equivalent to:
option match {
case Some(x) => f(x)
case None => None
}
Value parameters
f
the function to apply
Attributes
See also
Inherited from:
Source
Returns the nested scala.Option value if it is nonempty.
Returns the nested scala.Option value if it is nonempty. Otherwise, return None.
This is equivalent to:
option match {
case Some(Some(b)) => Some(b)
case _ => None
}
Value parameters
ev
an implicit conversion that asserts that the value is also an scala.Option.
Attributes
See also
Example
Some(Some("something")).flatten
Inherited from:
Source
Returns the result of applying f to this scala.Option's value if the scala.Option is nonempty. Otherwise, evaluates expression ifEmpty.
This is equivalent to:
option match {
case Some(x) => f(x)
case None => ifEmpty
}
This is also equivalent to:
option map f getOrElse ifEmpty
Value parameters
f
the function to apply if nonempty.
ifEmpty
the expression to evaluate if empty.
Attributes
Inherited from:
Source
Returns true if this option is empty or the predicate p returns true when applied to this scala.Option's value.
Returns true if this option is empty or the predicate p returns true when applied to this scala.Option's value.
This is equivalent to:
option match {
case Some(x) => p(x)
case None => true
}
Value parameters
p
the predicate to test
Attributes
Inherited from:
Source
Apply the given procedure f to the option's value, if it is nonempty.
Apply the given procedure f to the option's value, if it is nonempty. Otherwise, do nothing.
This is equivalent to:
option match {
case Some(x) => f(x)
case None => ()
}
Value parameters
f
the procedure to apply.
Attributes
See also
Inherited from:
Source
Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.
Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.
This is equivalent to:
option match {
case Some(x) => x
case None => default
}
Value parameters
default
the default expression.
Attributes
Inherited from:
Source
Returns true if the option is an instance of scala.Some, false otherwise.
Returns true if the option is an instance of scala.Some, false otherwise.
This is equivalent to:
option match {
case Some(_) => true
case None => false
}
Attributes
Inherited from:
Source
Returns true if the option is None, false otherwise.
Returns true if the option is None, false otherwise.
This is equivalent to:
option match {
case Some(_) => false
case None => true
}
Attributes
Inherited from:
Source
Returns a singleton iterator returning the scala.Option's value if it is nonempty, or an empty iterator if the option is empty.
Returns a singleton iterator returning the scala.Option's value if it is nonempty, or an empty iterator if the option is empty.
Attributes
Inherited from:
Source
The number of elements in this option, if it can be cheaply computed, -1 otherwise.
The number of elements in this option, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.
Attributes
Definition Classes
Inherited from:
Source
Returns a scala.Some containing the result of applying f to this scala.Option's value if this scala.Option is nonempty. Otherwise return None.
This is equivalent to:
option match {
case Some(x) => Some(f(x))
case None => None
}
Value parameters
f
the function to apply
Attributes
See also
Note
This is similar to flatMap except here, f does not need to wrap its result in an scala.Option.
Inherited from:
Source
Returns false if the option is None, true otherwise.
Returns false if the option is None, true otherwise.
This is equivalent to:
option match {
case Some(_) => true
case None => false
}
Attributes
Note
Implemented here to avoid the implicit conversion to Iterable.
Inherited from:
Source
Returns this scala.Option if it is nonempty, otherwise return the result of evaluating alternative.
Returns this scala.Option if it is nonempty, otherwise return the result of evaluating alternative.
This is equivalent to:
option match {
case Some(x) => Some(x)
case None => alternative
}
Value parameters
alternative
the alternative expression.
Attributes
Inherited from:
Source
Returns the option's value if it is nonempty, or null if it is empty.
Returns the option's value if it is nonempty, or null if it is empty.
Although the use of null is discouraged, code written to use scala.Option must often interface with code that expects and returns nulls.
This is equivalent to:
option match {
case Some(x) => x
case None => null
}
Attributes
Example
val initialText: Option[String] = getInitialText
val textField = new JComponent(initialText.orNull,20)
Inherited from:
Source
An iterator over the names of all the elements of this product.
An iterator over the names of all the elements of this product.
Attributes
Inherited from:
Source
An iterator over all the elements of this product.
An iterator over all the elements of this product.
Attributes
Returns
in the default implementation, an Iterator[Any]
Inherited from:
Source
Returns a scala.collection.Stepper for the elements of this collection.
The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.
The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.
- For collections of
Int,Short,ByteorChar, an scala.collection.IntStepper is returned - For collections of
DoubleorFloat, a scala.collection.DoubleStepper is returned - For collections of
Longa scala.collection.LongStepper is returned - For any other element type, an scala.collection.AnyStepper is returned
Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.
Attributes
Inherited from:
Source
Value parameters
right
the expression to evaluate and return if this is empty
Attributes
See also
Inherited from:
Source
Returns a singleton list containing the scala.Option's value if it is nonempty, or the empty list if the scala.Option is empty.
Returns a singleton list containing the scala.Option's value if it is nonempty, or the empty list if the scala.Option is empty.
This is equivalent to:
option match {
case Some(x) => List(x)
case None => Nil
}
Attributes
Inherited from:
Source
Value parameters
left
the expression to evaluate and return if this is empty
Attributes
See also
Inherited from:
Source
Converts an Option of a pair into an Option of the first element and an Option of the second element.
Converts an Option of a pair into an Option of the first element and an Option of the second element.
This is equivalent to:
option match {
case Some((x, y)) => (Some(x), Some(y))
case _ => (None, None)
}
Type parameters
A1
the type of the first half of the element pair
A2
the type of the second half of the element pair
Value parameters
asPair
an implicit conversion which asserts that the element type of this Option is a pair.
Attributes
Returns
a pair of Options, containing, respectively, the first and second half of the element pair of this Option.
Inherited from:
Source
Converts an Option of a triple into three Options, one containing the element from each position of the triple.
Converts an Option of a triple into three Options, one containing the element from each position of the triple.
This is equivalent to:
option match {
case Some((x, y, z)) => (Some(x), Some(y), Some(z))
case _ => (None, None, None)
}
Type parameters
A1
the type of the first of three elements in the triple
A2
the type of the second of three elements in the triple
A3
the type of the third of three elements in the triple
Value parameters
asTriple
an implicit conversion which asserts that the element type of this Option is a triple.
Attributes
Returns
a triple of Options, containing, respectively, the first, second, and third elements from the element triple of this Option.
Inherited from:
Source
Returns a scala.Some formed from this option and another option by combining the corresponding elements in a pair.
Returns a scala.Some formed from this option and another option by combining the corresponding elements in a pair. If either of the two options is empty, None is returned.
This is equivalent to:
(option1, option2) match {
case (Some(x), Some(y)) => Some((x, y))
case _ => None
}
Value parameters
that
the options which is going to be zipped
Attributes
Example
// Returns Some(("foo", "bar")) because both options are nonempty.
Some("foo") zip Some("bar")
// Returns None because `that` option is empty.
Some("foo") zip None
// Returns None because `this` option is empty.
None zip Some("bar")
Inherited from:
Source