'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, '');

};