js/src/Y.js@6474c204b198 (annotated)
js/src/Y.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | // The Y combinator, applied to the factorial function |
| michael@0 | 6 | |
| michael@0 | 7 | // Return the function that is the fixed point of f. |
| michael@0 | 8 | var Y = f => (x => f(v => x(x)(v))) |
| michael@0 | 9 | (x => f(v => x(x)(v))); |
| michael@0 | 10 | |
| michael@0 | 11 | // The factorial function is the fixed point of this: |
| michael@0 | 12 | var f = fac => n => (n <= 1) ? 1 : n * fac(n - 1); |
| michael@0 | 13 | |
| michael@0 | 14 | print("5! is " + Y(f)(5)); |
