code: function last(arr, cb, thisArg) {
    if (arguments.length === 1) {
      return arr[arr.length - 1];
    }
    if (typeOf(cb) === 'string') {
      return findLast(arr, isType(cb));
    }
    return findLast(arr, cb, thisArg);
  }
docs: Return the last element in `array`, or, if a callback is passed,
  return the last value for which the returns true.
  
  ```js
  // `one` and `two` are functions
  var arr = ['a', {a: 'b'}, 1, one, 'b', 2, {c: 'd'}, two, 'c'];
  
  utils.last(arr);
  //=> 'c'
  
  utils.last(arr, isType('function'));
  //=> two
  
  utils.last(arr, 'object');
  //=> {c: 'd'}
  ```
  @param  {Array} `array`
  @return {*}
  @api public