OptionMethodsExtension<T extends Object> extension
Methods
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and<U extends Object>(Option<U> other)
→ Option<U>
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Returns None if the option is None, otherwise returns
other.
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andThen<U extends Object>(Option<U> f(T))
→ Option<U>
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Returns None if the option is None, otherwise calls f with the wrapped value and returns the result. Some
languages call this operation flatmap.
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expect(String msg)
→ T
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Returns the contained Some value if Some, otherwise throws a Panic.
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filter(bool predicate(T))
→ Option<T>
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Returns None if the option is None, otherwise calls predicate with the wrapped value and returns
Some(t) if predicate returns true (where t is the wrapped value), and
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inspect(dynamic f(T))
→ Option<T>
-
Calls the provided closure with a reference to the contained value
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isNone()
→ bool
-
Returns true if the option is a None value.
-
isSome()
→ bool
-
Returns true if the option is a Some value.
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isSomeAnd(bool f(T))
→ bool
-
Returns true if the option is a Some and the value inside of it matches a predicate.
-
iter()
→ Iter<T>
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Returns an Iter over the possibly contained value.
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map<U extends Object>(U f(T))
→ Option<U>
-
Maps an this Option
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mapOr<U>(U defaultValue, U f(T))
→ U
-
Returns the provided default result (if none), or applies a function to the contained value (if any).
-
mapOrElse<U>(U defaultFn(), U f(T))
→ U
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Computes a default function result (if none), or applies a different function to the contained value (if any).
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okOr<E extends Object>(E err)
→ Result<T, E>
-
Transforms the Option
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okOrElse<E extends Object>(E errFn())
→ Result<T, E>
-
Transforms the Option
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or(Option<T> other)
→ Option<T>
-
Returns the option if it contains a value, otherwise returns other.
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orElse(Option<T> f())
→ Option<T>
-
Returns the option if it contains a value, otherwise calls f and returns the result.
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toNullable()
→ T?
-
Returns the inner type as the nullable version of
T
-
unwrap()
→ T
-
Returns the contained Some value, consuming the self value.
-
unwrapOr(T defaultValue)
→ T
-
Returns the contained Some value or a provided default.
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unwrapOrElse(T f())
→ T
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Returns the contained Some value or computes it from a closure.
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xor(Option<T> other)
→ Option<T>
-
Returns Some if exactly one of self,
other is Some, otherwise returns None.
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zip<U extends Object>(Option<U> other)
→ Option<(T, U)>
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Zips self with another Option.
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zipWith<U extends Object, R extends Object>(Option<U> other, R f(T, U))
→ Option<R>
-
Zips self and another Option with function f
Operators
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operator [](_OptionEarlyReturnKey op)
→ T
-
Functions an "Early Return Operator" when given an "Early Return key" "$". See
Option.$ for more information.
