git.r.bdr.sh - rbdr/dotfiles/blob - atom/packages/vim-mode/node_modules/grim/node_modules/emissary/node_modules/es6-weak-map/node_modules/es5-ext/function/#/compose.js

   1 'use strict';
   2
   3 var callable = require('../../object/valid-callable')
   4   , aFrom    = require('../../array/from')
   5
   6   , apply = Function.prototype.apply, call = Function.prototype.call
   7   , callFn = function (arg, fn) { return call.call(fn, this, arg); };
   8
   9 module.exports = function (fn/*, …fnn*/) {
  10         var fns, first;
  11         if (!fn) callable(fn);
  12         fns = [this].concat(aFrom(arguments));
  13         fns.forEach(callable);
  14         fns = fns.reverse();
  15         first = fns[0];
  16         fns = fns.slice(1);
  17         return function (arg) {
  18                 return fns.reduce(callFn, apply.call(first, this, arguments));
  19         };
  20 };