I have a nested data structure containing objects and arrays. How can I extract the information, i.e. access a specific or multiple values (or keys)?  For example:  var data = {     code: 42,     items: [{         id: 1,         name: 'foo'...
I've been told not to use for...in with arrays in JavaScript. Why not?...
I have an array like this:  var arr1 = ["a", "b", "c", "d"];   How can I randomize / shuffle it?...
How can I loop through all the entries in an array using JavaScript?  I thought it was something like this:  forEach(instance in theArray)   Where theArray is my array, but this seems to be incorrect....
What is the most concise and efficient way to find out if a JavaScript array contains an object?  This is the only way I know to do it:  function contains(a, obj) {     for (var i = 0; i < a.length; i++) {         if (a[i] === obj) {...
I'll start with the code:  var s = ["hi"]; console.log(s); s[0] = "bye"; console.log(s);   Simple, right?  In response to this, Firebug says:  ["hi"] ["bye"]   Wonderful, but Chrome's JavaScript console (7.0....
I have an array of Numbers, and I'm using the .push() method to add elements to it.  Is there a simple way to remove a specific element from an array? The equivalent of something like array.remove(number);.  I have to use core JavaScript - no f...
In Java you can use a for loop to traverse objects in an array as follows:  String[] myStringArray = {"Hello", "World"}; for (String s : myStringArray) {     // Do something }   Can you do the same in JavaScript?...
This question already has an answer here:                           Get all unique values in a JavaScript array (remove duplicates)                                      73 answers                                     I have a very simp...
I have a JavaScript array like:  [["$6"], ["$12"], ["$25"], ["$25"], ["$18"], ["$22"], ["$10"]]   How would I go about merging the separate inner arrays into one like:  ["$6", "$12...

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