tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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Y.js (529B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 // The Y combinator, applied to the factorial function.
      6 
      7 // Return the function that is the fixed point of f.
      8 const Y = f => (x => f(v => x(x)(v)))
      9               (x => f(v => x(x)(v)));
     10 
     11 // The factorial function is the fixed point of this:
     12 const f = fac => n => (n <= 1) ? 1 : n * fac(n - 1);
     13 
     14 print(`5! is ${Y(f)(5)}`);