clone and extend in vanilla javascript

gistfile1.txt

this.clone = function(obj) {
  var key, temp;
  if (obj === null || typeof obj !== 'object' || typeof obj === 'function') return obj;
  temp = obj.constructor();
  for (key in obj) temp[key] = this.clone(obj[key]);
  return temp;
};

this.merge = function(source, obj, clone) {
  var prop, v;
  if (source == null) return source;
  for (prop in obj) {
    v = obj[prop];
    if ((source[prop] != null) && typeof source[prop] === 'object' && typeof obj[prop] === 'object') {
      this.merge(source[prop], obj[prop]);
    } else {
      if (clone) {
        source[prop] = this.clone;
      } else {
        source[prop] = obj[prop];
      }
    }
  }
  return source;
};

gistfile2.txt

@clone = (obj) ->
  key = undefined
  temp = undefined
  if obj == null or typeof obj != 'object' or typeof obj == 'function'
    return obj
  temp = obj.constructor()
  for key of obj
    temp[key] = @clone(obj[key])
  temp

@merge = (source, obj, clone) ->
  return source if source == null
  for prop of obj
    v = obj[prop]
    if source[prop] != null and typeof source[prop] == 'object' and typeof obj[prop] == 'object'
      @merge source[prop], obj[prop]
    else
      if clone
        source[prop] = @clone
      else
        source[prop] = obj[prop]
  source