where method

@override @useResult None<T> where(bool condition(T value))

Returns a Some of the original value if this is a Some and its contained value satisfies condition, or None otherwise.

Examples

// prints "Some(2)"
print(const Some(2).where((value) => true));

// prints "None"
print(const Some(2).where((value) => false));

Implementation

@override
@useResult
None<T> where(bool Function(T value) condition) => this;