/**
 * String prototype extension.
 */


/**
 * Capitalize a string.
 *
 * @return Capitalized string.
 */
String.prototype.capitalize = function () {
    return this.charAt(0).toUpperCase() + this.slice(1);
};


/**
 * 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, "");
};