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.A function that returns true or 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.
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.
Transforms the Option<T> into a Result<T, E>, mapping Some(v) to Ok(v) and None to Err(err()).
A function that returns the error value for Err if the Option is None.
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.
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.
+A function that computes a default value.
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.
the contained Some value or computes it from a closure.
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 is truthy.
StaticfromWrap a value in an Option if the value is truthy.
A value of type T
Wrap a value in an Option if the value satisfies the predicate.
Wrap 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.