Javascript String rstrip(chars)

/**//ww w .j  a v a 2 s  .  c  o m
 * Strip characters at the end of a string.
 *
 * @param   chars   A regex-like element to strip from the end.
 * @return  Stripped string.
 */
String.prototype.rstrip = function (chars) {
    let regex = new RegExp(chars + "$");
    return this.replace(regex, "");
};