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var counter = (function() {
  var privateCounter = 0;
  function changeBy(val) {
    privateCounter += val;
  }
  return {
    increment: function() {
      changeBy(1);
    },
    decrement: function() {

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// For Internet Explorer support
Number.isInteger = Number.isInteger || function(value) {
  return typeof value === 'number' && 
    isFinite(value) && 
    Math.floor(value) === value;
};
Number.isInteger(45); // return true 

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/**
* Simple namespace util to extand Class.js functionality
* and wrap classes in namespace.
* @author tommy.rochette[followed by the usual sign]universalmind.com
* @type {*}
* @return Object
*/
window.namespace = function(namespaces){
   'use strict';
   var names = namespaces.split('.');

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var a = { 'a': 1, 'b': 2, 'c': 3 };
var b = { 'c': 3, 'd': 4, 'e': 5 };

_.intersection(_.keys(a), _.keys(b)); // ['c']
_.difference(_.keys(a), _.keys(b)); // ['a', 'b']
_.isEqual(a, b); // false

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moment("2017-12-27", "YYYY-MM-DD").unix(); // 1514322000
moment.unix(1514322000).format("DD-MM-YYYY"); // seconds

moment(1318781876406).format("DD-MM-YYYY H:m:s"); // milliseconds

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var reg = new RegExp("^[1-9][0-9]*$");

reg.test("5"); // true
reg.test("15"); // true
reg.test(15); // true
reg.test("0"); // false
reg.test("-1"); // false
reg.test("5abc"); // false
reg.test("abc"); // false

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function Thing(name) {
    this.name = name;
}
Thing.prototype.doSomething = function(callback, salutation) {
    // Call our callback, but using our own instance as the context
    callback.call(this, salutation);
}

function foo(salutation) {

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_.map(render.questionList.questions, function(x, index) {
  x.itemIndex = index + 1;
  return x;
});

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function escapeHtml(text) {
  var map = {
    '&': '&',
    '<': '&lt;',
    '>': '&gt;',
    '"': '&quot;',
    "'": '&#039;'
  };

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_.mixin({ // Lodash add custom function
  'isSame' : function(x, y) {
    return x == y;
  }
});