Javascript Number times(callback)

/**//from  www  . j  av  a 2  s.c o  m
 * Invoke a callback n number of times where n is the value of `this`
 *
 * @param callback {Function}
 */
Number.prototype.times = function(callback) {
  if (typeof callback !== 'function') {
    throw new TypeError(callback + ' is not a function');
  }

  for (let i = 0; i < this; i++) {
    callback();
  }
};

Number.prototype.times = function(callback){
    for (var i = 0; i < this; i++) {
      callback();/*from ww  w  .ja v a2s .c o  m*/
    }
};