furf’s functional funpack

fu.js

/**
 * Introducing fu: furf's functional funpack.
 * "Putting the F-U back in JS!"
 * 
 * fu.Array.map([1, 2, 3], a => a * 2) => [2, 4, 6]
 * fu.String.repeat('fu  ', 3) => "fu fu fu"
 */
this.fu = (function() {

  const call = Function.prototype.call;
  const bind = call.bind.bind(call);

  function invert(Native) {
    const prototype = Native.prototype;
    return Object.getOwnPropertyNames(prototype).reduce(function(map, key) {
      const val = prototype[key];
      map[key] = (typeof val === 'function') ? bind(val) : val => val[key];
      return map;
    }, {});
  }

  return [Array, Number, Object, String].reduce(function(obj, Native) {
    obj[Native.name] = invert(Native);
    return obj;
  }, {});

})();

fu.min.js

this.fu=(f=>f.bind.bind(f.call))(u=>u)

I'll just leave this here https://twitter.com/cowboy/status/125423802975928320