Array « Var « Javascript Data Type Q&A

1. problem Getting the keys alone from Associative array ? for (var key in AssociativeArray) returns all the keys and its prototype members    stackoverflow.com

I am having small problem in my JS where i need to iterate through all the keys in the associative array.

var listOfKeys=new Array();
for (var key in parsedArray)
{
    ...

2. Javascript array index is a var    stackoverflow.com

I'm working on a website with Jquery tabs dynamically generated. Each tab has an ID. For the purpose of my script I need to know how many times the user has clicked ...

3. Javascript :: Does better to write: var arr=[]; then var arr=new Array();?    stackoverflow.com

Does better to write and why:

var arr=[]; then var arr=new Array(); 
var obj={}; then var obj=new Object();

4. Is Array(5) equivalent to var a = []; a.length = 5; in JS?    stackoverflow.com

I see four five options to initialize an array to a specific length in JS, (the last one is a stretch, I know):

var a = []; a.length = 5;

var a = ...

5. Comparing array to var during iteration(cont.)    stackoverflow.com

So here's my problem.. Might just be tired but, I want counter to ++ only if number has not occurred in array. Meaning during the 4 iterations, counter should ++ only on ...

6. attribute name "var" in javascript associative array    stackoverflow.com

Quick question out of curiosity: code below works in Firefox and Chrome but not in Safari. Is this Javascript spec circumvented by Firefox and Chrome or is this a quirk in Safari? ...

7. Can someone confirm if this theory is correct? - Javascript & Arrays    stackoverflow.com

I am learning javascript and really just started - I am using the Firebug Extension in Firefox to try out a few things. I have set up 2 var(iables) and the ...

8. [Other] One var out of five in an array doesn't work    forums.devshed.com

GDownloadUrl("../scripts/genxml.php", function(data) { var xml = GXml.parse(data); var markers = xml.documentElement.getElementsByTagName("marker"); // create an array to store references to all markers var markersArray=[]; for (var i = 0; i < markers.length; i++) { var name = markers[i].getAttribute("name"); var id = markers[i].getAttribute("id"); var address = markers[i].getAttribute("address"); var type = markers[i].getAttribute("type"); var point = new GLatLng(parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng"))); var marker = createMarker(point, name, address, ...

9. I wanna assigna a dynamic var to an array but how?    forums.devshed.com

First off it's not an array it's a map of name value pairs. My guess is that you are actually assigning the value of 'district_id' to 'district' in the map, but that the value of district_id is undefined or null. Try to assign any static value to the variable to see if this is indeed the case, and if it is ...

10. Array of var names, setting their values    forums.devshed.com

The reason you get undefined in your initial example is because you aren't setting the data for that variable; rather, you're changing the contents of that array cell, in effect changing the variable name you're storing. So when you do eval, it's looking for a variable name called "something", not "thisvarname" or any of the other names you have.

11. var 2darry = new array() vs var 2darry = new array(2)    forums.devshed.com

12. Concatenating var with array index    sitepoint.com

Hello, I don't understand why/how to properly concatenate an array index with a var. I have a var strarr that is the name of the array and strimg which is the array index. When I literally type in the array name (afterarr) it works: imgwidth = afterrarr[strimg][1]; but when I try to add the strarr var with the index: imgwidth = ...