Returns an iterator over the possibly contained value.
+A function that returns an Option
Returns None if the Option is None, otherwise calls predicate with the wrapped value and returns:
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 with inferred new type), andNone if predicate returns false.Returns None if the Option is None, otherwise calls predicate with the wrapped value and returns:
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), andNone if predicate returns false.Converts from Option<Option<T>> to Option<T>
Converts from Option<Option<T>> to Option<T>
A function that returns true if the value satisfies the predicate, otherwise false
A function that returns true if the value satisfies the predicate, otherwise false
OptionalthisArg: anyIf provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
true if the Option is a Some and and the value inside of it matches a predicate.
Maps an Option<T> to Option<U> by applying a function to a contained value (if Some) or returns None (if None).
Extract the value from an Option in a way that handles both the Some and None cases.
Transforms the Option<T> into a Result<T, E>, mapping Some(v) to Ok(v) and None to Err(err).
Transforms the Option<T> into a Result<T, E>, mapping Some(v) to Ok(v) and None to Err(err).
Arguments passed to okOr are eagerly evaluated; if you are passing the result of a function call, it is recommended to use okOrElse, which is lazily evaluated.
The error value for Err if the Option is None.
A function that returns an Option
Transposes an Option(Result) into Result(Option).
Transposes an Option(Result) into Result(Option).
None will be mapped to Ok(None).Some(Ok(_)) and Some(Err(_)) will be mapped to Ok(Some(_)) and Err(_).Some(value) will be mapped to Ok(Some(value)).the contained Some value or undefined otherwise.
Arguments passed to unwrapOr are eagerly evaluated; if you are passing the result of a function call, it is recommended to use unwrapOrElse, which is lazily evaluated.
default value
+default value
the contained Some value or a provided default.
Arguments passed to unwrapOr are eagerly evaluated; if you are passing the result of a function call, it is recommended to use unwrapOrElse, which is lazily evaluated.
A function that computes a default value.
+Unzips an Option containing a tuple of two Options.
Unzips an Option containing a tuple of two Options.
[Some(a), Some(b)] if this is Some([a, b]), otherwise [None, None].
An Option
Zips this with another Option.
Zips this and another Option with function fn.
StaticfromWrap a value in an Option if the value satisfies the predicate.
Source value
A function that returns true if the value satisfies the predicate, otherwise false
OptionalthisArg: anyIf provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.
Wrap a value in an Option if the value satisfies the predicate.
Wrap a value in an Option if the value satisfies the predicate.
StaticisStaticisStaticis
The
-Optiontype is an immutable representation of an optional value: everyOptionis eitherSomeand contains a value, orNoneand does not.