Functional Programming - Understand the Hazards of Using Imperative Code

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

function Window(tabs) {
  this.tabs = tabs;

Window.prototype.tabClose = function (tab) {
  var index = this.tabs.indexOf(tab);
  if (index > -1) {
    // Use the index returned by indexOf()
    var index = this.tabs.splice(1);

Window.prototype.tabOpen = function (tab) {
  this.tabs.push("new tab");

var workWindow = new Window(["GMail", "Inbox", "Work mail", "Docs", "freeCodeCamp"]);
var socialWindow = new Window(["FB", "Gitter", "Reddit", "Twitter", "Medium"]);
var videoWindow = new Window(["Netflix", "YouTube", "Vimeo", "Vine"]);

var windows = [workWindow, socialWindow, videoWindow];

// Make some tabs!

// Now let's see the final list of open tabs
var finalTabs = "";
windows.forEach(function (window) {
  finalTabs += window.tabs.join(", ") + "\n";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36

Challenge: Functional Programming - Understand the Hazards of Using Imperative Code

Link to the challenge:

Please Tell us what’s happening in your own words.

Learning to describe problems is hard, but it is an important part of learning how to code.

Also, the more you say, the more we can help!

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