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Module

x/fun/mod.ts>option.fromPredicate

A collection of algebraic data types, lenses, and schemables based on a light weight higher kinded type implementation. Written for deno.
baetheus/fun
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function option.fromPredicate
import { option } from "https://deno.land/x/fun@v2.0.0-alpha.6/mod.ts";
const { fromPredicate } = option;

fromPredicate will test the value a with the predicate. If the predicate evaluates to false then the function will return a None, otherwise the value wrapped in Some

TODO: Overload with refinement

Examples

const fromPositiveNumber = fromPredicate((n: number) => n > 0); const a = fromPositiveNumber(-1); // None const a = fromPositiveNumber(1); // Some

Type Parameters

A
B extends A

Parameters

refinement: Refinement<A, B>

Returns

(a: A) => Option<B>

Parameters

refinement: Predicate<A>

Returns

(a: A) => Option<A>