Find specific key value in array of objects

Question

This is the code:

var groups = {
    "JSON":{
        "ARRAY":[
            {"id":"fq432v45","name":"Don't use me."},

            {"id":"qb45657s","name":"Use me."}
        ]
    }
}

I want to get the name value where the id is "qb45657s" how could this be accomplished? I figured the obvious loop through all of the array and check if it's equal but is there an easier way?

Edit: I cannot change "Array" to an object because I need to know the length of it for a different function.

This is not valid JSON... is there an enclosing {} around the whole thing? — Mike Brant
– Mike Brant, Commented Feb 11, 2013 at 23:23
JSON is text, a string. Your question is about finding a key in a hash. In Javascript that's an object, but JSON can be parsed into structures in other languages as well. EDIT: and after the edit it's Javascript code, no JSON - JSON is a string. — Mörre
– Mörre, Commented Feb 11, 2013 at 23:25
But it is MY point. You should LEARN something. Confusion about what things are eventually leads to trouble. — Mörre
– Mörre, Commented Feb 11, 2013 at 23:26
Boy do you ever need an attitude change. I wouldn't spend a second helping this guy, though clearly he needs it. — the system
– the system, Commented Feb 11, 2013 at 23:33
Regardless of the questioners comments, I think this is an interesting question but it seems people are voting on the questioner's attitude instead of the question itself. — fiz
– fiz, Commented Feb 11, 2013 at 23:51

mVChr · Accepted Answer · 2013-02-11 23:24:39Z

14

You can simply filter on the given id:

groups["JSON"]["ARRAY"].filter(function(v){ return v["id"] == "qb45657s"; });

This will return [{"id":"qb45657s","name":"Use me."}]

answered Feb 11, 2013 at 23:24

mVChr

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2 Comments

alex Over a year ago

Why use ["JSON"] instead of accessing via .?

alex Over a year ago

@TheSuburbanGangster There ain't no jQuery there.

Mike Brant · Accepted Answer · 2013-02-11 23:29:13Z

0

Assuming you had a valid JSON string like this (note I say valid, because you need an enclosing {} or [] to make it valid):

var json = '{"JSON":{
        "ARRAY":[
            {"id":"fq432v45","name":"Don't use me."},
            {"id":"qb45657s","name":"Use me."}
        ]
    }
}';

You would just parse it into an actual object like this:

var jsonObj = JSON.parse(json); // makes string in actual object you can work with
var jsonArray = jsonObj.JSON.ARRAY; // gets array you are interested in

And then search for it like:

var needle = 'qb45657s';
var needleName;
for (var i = 0; i < jsonArray.length; i++) {
    if (jsonArray[i].id === needle) {
        needleName = jsonArray[i].name;
    }
}

answered Feb 11, 2013 at 23:29

Mike Brant

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