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....
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....
Let's say that I have an Javascript array looking as following:    ["Element 1","Element 2","Element 3",...]; // with close to a hundred elements.   What approach would be appropriate to chunk (split) the array into many...
Is there a way to return the difference between two arrays in JavaScript?  For example:  var a1 = ['a', 'b']; var a2 = ['a', 'b', 'c', 'd'];  // need ["c", "d"]   Any advice greatly ap...
Trying to get the highest and lowest value from an array that I know will contain only integers seems to be harder than I thought.    var numArray = [140000, 104, 99]; numArray = numArray.sort(); alert(numArray)     I'd expect this to show 99,...
I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way to do this? I just need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated....
I have been reading online and some places say it isn't possible, some say it is and then give an example and others refute the example, etc.    How do I declare a 2 dimensional array in JavaScript? (assuming it's possible)  How would I acc...

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