Fastest way to iterate through JSON string in Javascript

Question

I have been using $.each of the jQuery framework to iterate through a JSON string that I receive via an AJAX call. Now this string is sometimes quite huge and as a result IE6/7/8 crawl as a result.

I am wondering if there is a faster way to iterate through the entire data.

Thank you for your time.

Solution 1

Hope to be still in time!

How about a simple -for-?

for(i = 0; i < data.length; i++) {
    data[i].property = 'todo';
}

Otherwise -for in-

var mycars = [{name:'Ferrari'}, {name:'BMW'}];
for (i in mycars)
{
    document.write(mycars[i].name + "<br />");
}

Here is the complete answer: How do I iterate over a JSON structure?

Solution 2

How about using the regular javascript functions?

If for example you have a JSON object with items in them, you could just eval the JSON string to convert it to javascript objects, and iterate over them using 'for (i in object)'.

Comments

[redsquare]

some good clientside parsing & performance tips from flickr

[T J]

What is the structure of this json..? just a huge object or a huge array of objects..?

[redsquare]

I assume Alec is using the json dataType in the xhr call therefore jquery will be eval'ing the response.