filter

Returns the option if the predicate evaluates to true; otherwise, None. Always returns None id option is None.

Type

type filter = <T>(predicate: Predicate<T>) => (option: Option<T>) => boolean

Examples

import {filter, Some, None} from 'fnxt/option';

const filterGreaterFive = filter((x:number)=> x > 5);
filterGreaterFive(Some(42))  // -> Some(42)
filterGreaterFive(Some(0))   // -> None
filterGreaterFive(None)      // -> None

See Also

• forall
• exists