code: function pad(string, length, chars) {
        string = string == null ? '' : String(string);
        length = +length;
  
        var strLength = string.length;
        if (strLength >= length || !nativeIsFinite(length)) {
          return string;
        }
        var mid = (length - strLength) / 2,
            leftLength = floor(mid),
            rightLength = ceil(mid);
  
        chars = createPad('', rightLength, chars);
        return chars.slice(0, leftLength) + string + chars;
      }
docs: Pads `string` on the left and right sides if it is shorter then the given
  padding length. The `chars` string may be truncated if the number of padding
  characters can't be evenly divided by the padding length.
  
  @static
  @memberOf _
  @category Strings
  @param {string} [string=''] The string to pad.
  @param {number} [length=0] The padding length.
  @param {string} [chars=' '] The string used as padding.
  @returns {string} Returns the padded string.
  @example
  
  _.pad('abc', 8);
  // => '  abc   '
  
  _.pad('abc', 8, '_-');
  // => '_-abc_-_'
  
  _.pad('abc', 3);
  // => 'abc'