collection « object « Javascript Data Type Q&A

1. Javascript collection of DOM objects - why can't I reverse items order with Array.reverse()?    stackoverflow.com

What would be the problem with reversing the array of DOM objects got from a command like:

var imagesArr = new Array();
imagesArr = document.getElementById("myDivHolderId").getElementsByTagName("img");
imagesArr.reverse();

2. Number of elements in a javascript object    stackoverflow.com

Is there a way to get (from somewhere) the number of elements in a javascript object?? (i.e. constant-time complexity). I cant find a property or method that retrieve that information. So far ...

3. JavaScript: sorting collection, which is not an array    stackoverflow.com

I have a collection of objects in JavaScript like this:

Object collection = new Object();
collection[123] = new Item(); //another object
collection[425] = new Item();
collection[2134] = new Item();
//etc. etc.

//TODO: sort items

4. Objects for unordered collections and arrays for ordered collections in Javascript?    stackoverflow.com

I have learned from somewhere that if I have a unordered collection (eg. a list of things to buy) I should use an object literal in Javascript. And if I have ...

5. `new` without `delete` on same variable in Javascript    stackoverflow.com

Is it OK to do this?:

function mygetTime()
{
    var d = new Date();
    return(d.getTime());
}

function wasteSomeMemory()
{
    var temp;
    for(var count = ...

6. How to sort a collection of objects in an Array in Javascript?    stackoverflow.com

I have a collection objects in an array,

[{A:2, B:2},{A:2, B:3},{A:1, B: 2}, {A:1, B:1}]

7. How do I make an array element [object INPUT] instead of [object Collection]?    sitepoint.com

How do I make an array element [object INPUT] instead of [object Collection]? Hello, I am working with Lasso 8, and using Javascript for my error trapping, and MySQL as my database. I have several 'Date Fields' that are made up of 3 drop downs: Month, Day, Year. When the user selects each of these things and hits the submit button, ...