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.

How are you iterating through it? Are you parsing it, or are you evaling it? Do you need just certain parts? — cgp
– cgp, Commented Jun 26, 2009 at 19:02
What is the structure of this json..? just a huge object or a huge array of objects..? — T J
– T J, Commented Jan 17, 2016 at 6:09

ylebre · Accepted Answer · 2009-06-26 19:01:02Z

1

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)'.

answered Jun 26, 2009 at 19:01

ylebre

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1 Comment

redsquare Over a year ago

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

IvanF. · Accepted Answer · 2018-06-07 13:14:17Z

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?

answered Jun 7, 2018 at 13:14

IvanF.

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