function trimEnd(string, chars, guard) {
      string = toString(string);
      if (string && (guard || chars === undefined)) {
        return string.replace(reTrimEnd, '');
      }
      if (!string || !(chars = baseToString(chars))) {
        return string;
      }
      var strSymbols = stringToArray(string),
          end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;

      return castSlice(strSymbols, 0, end).join('');
    }
Removes trailing whitespace or specified characters from `string`.

@static
@memberOf _
@since 4.0.0
@category String
@param {string} [string=''] The string to trim.
@param {string} [chars=whitespace] The characters to trim.
@param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
@returns {string} Returns the trimmed string.
@example

_.trimEnd('  abc  ');
// => '  abc'

_.trimEnd('-_-abc-_-', '_-');
// => '-_-abc'