'use strict'; exports.repeat = function (str, num) {  var result = '';  for (var i = 0; i < num; i++) { result += str; }  return result;}; exports.arrayEqual = function (a, b) {  if (a.length !== b.length) { return false; }  for (var i = 0; i < a.length; i++) {    if (a[i] !== b[i]) { return false; }  }  return true;}; exports.trimChars = function (str, chars) {  var start = 0;  var end = str.length - 1;  while (chars.indexOf(str.charAt(start)) >= 0) { start++; }  while (chars.indexOf(str.charAt(end)) >= 0) { end--; }  return str.slice(start, end + 1);}; exports.capitalize = function (str) {  return str.charAt(0).toUpperCase() + str.slice(1);}; exports.arrayUnion = function () {  var result = [];  for (var i = 0, values = {}; i < arguments.length; i++) {    var arr = arguments[i];    for (var j = 0; j < arr.length; j++) {      if (!values[arr[j]]) {        values[arr[j]] = true;        result.push(arr[j]);      }    }  }  return result;}; function has(obj, key) {  return Object.prototype.hasOwnProperty.call(obj, key);} exports.has = has; exports.extend = function (dest, src) {  for (var i in src) {    if (has(src, i)) { dest[i] = src[i]; }  }}; exports.trimEnd = function (str) {  return str.replace(/\s+$/g, '');};