Maybe

Common Functional Programming Algebraic data types for JavaScript that is compatible with most modern browsers and Deno.

functionalland/functional

Latest

library

mod.ts (default module)

SumTypeRepresentationPrototype

TaskPrototype

TypeRepresentationPrototype

alt

log

log

alt

log

variable Maybe

import { Maybe } from "https://deno.land/x/functional@v1.3.4/mod.js";

The Maybe is the most common sum type; it represents the possibility of a value being null or undefined.

The Maybe type implements the following algebras:

[x] Alternative
[x] Comonad
[x] Monad

Example

import Maybe from "https://deno.land/x/functional@v1.3.2/library/Maybe.js";

const containerA = Maybe.Just(42).map(x => x + 2);
const containerB = Maybe.Nothing.map(x => x + 2);

assert(Maybe.Just.is(containerA));
assert(containerA.extract() === 44);
assert(Maybe.Nothing.is(containerB));