A function which allows the augmentation of an Object with functional methods.

fnChain.js

// Here is a JSFiddle with a concrete example: https://jsfiddle.net/SeanJM/rg3ftcgk/1/
// This is one of Sean's most leveraged functions, which he uses to keep my code nice and modular
function fnChain(target, source, args) {
  'use strict';
  var objProto = Object.prototype, hasOwn, chain, k;
  if (objProto.toString.apply(args) !== '[object Array]') {
    throw new TypeError('Invalid argument for "fnChain": The 3rd argument must be an array of arguments.');
  }
  hasOwn = objProto.hasOwnProperty;
  chain = function chain(k) {
    function chainApply() {
      var len = arguments.length, aArgs = new Array(len), i, b;
      for (i = 0; i < len; i++) { // https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#3-managing-arguments
        aArgs[i] = arguments[i];
      }
      b = source[k].apply(null, args.concat(aArgs));
      return typeof b === 'undefined' ? target : b;
    }
    return chainApply;
  };
  for (k in source) {
    if (typeof source[k] === 'function' && !(k in target) && hasOwn.call(source, k)) {
      target[k] = chain(k);
    }
  }
  return target;
}