https://github.com/mozilla/gecko-dev
Raw File
Tip revision: 5f7a23cd48ccb45086743e509fd4ec492f6441eb authored by Ryan VanderMeulen on 12 September 2023, 00:19:25 UTC
Bug 1852649 - Cherry-pick upstream libwebp fix. r=tnikkel, a=RyanVM
Tip revision: 5f7a23c
Y.js
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

// The Y combinator, applied to the factorial function.

// Return the function that is the fixed point of f.
const Y = f => (x => f(v => x(x)(v)))
               (x => f(v => x(x)(v)));

// The factorial function is the fixed point of this:
const f = fac => n => (n <= 1) ? 1 : n * fac(n - 1);

print(`5! is ${Y(f)(5)}`);
back to top