code: function(collection, callback) {
      var index, iterable = collection, result = iterable;
      if (!iterable) return result;
      if (!objectTypes[typeof iterable]) return result;
        for (index in iterable) {
          if (callback(iterable[index], index, collection) === indicatorObject) return result;
        }
      return result
    }
docs: Iterates over own and inherited enumerable properties of an object,
  executing the callback for each property. The callback is bound to `thisArg`
  and invoked with three arguments; (value, key, object). Callbacks may exit
  iteration early by explicitly returning `false`.
  
  @static
  @memberOf _
  @type Function
  @category Objects
  @param {Object} object The object to iterate over.
  @param {Function} [callback=identity] The function called per iteration.
  @param {*} [thisArg] The `this` binding of `callback`.
  @returns {Object} Returns `object`.
  @example
  
  function Shape() {
  this.x = 0;
  this.y = 0;
  }
  
  Shape.prototype.move = function(x, y) {
  this.x += x;
  this.y += y;
  };
  
  _.forIn(new Shape, function(value, key) {
  console.log(key);
  });
  // => logs 'x', 'y', and 'move' (property order is not guaranteed across environments)