Creates an object by taking an array of keys, type of the key's value and key's default value. Contains an in-house deeply recursive object cloner

object-factory.js

var keys = ['apple', 'orange', 'grape', 'banana'];

function gen(keys, type, def) {
  var constructor = type.constructor;
  var obj = {};
  keys.forEach(function(key) {
    obj[key] = typeof constructor === 'function' ? constructor(clone(def)) : undefined;
  });

  return obj;

  function clone(obj) {
    if(obj == null || typeof(obj) != 'object')
        return obj;

    var temp = obj.constructor(); // changed

    for(var key in obj) {
        if(obj.hasOwnProperty(key)) {
            temp[key] = clone(obj[key]);
        }
    }
    return temp;
  }
}

// Tests
console.log(gen(keys, [], [1,2,3]));

console.log(gen(keys, 5, 100));

console.log(gen(keys, function() {}, 'args'));

console.log(gen(keys, new RegExp(), /m[a|e]n/g));

console.log(gen(keys, new Date()));

console.log(gen(keys, '', 'foo'));