Access JavaScript object elements by index

Question

In the following code I want to access key, value dynamically in the for loop. How can I do it?

 s= {5: "456", 6: "123"} 
 var count = Object.keys(s).length
 for (var j_cnt=0;j_cnt<count;j_cnt++)
 {

 }

Note: I do not want a normal for loop since i need to something with the count

duplicate http://stackoverflow.com/questions/684672/loop-through-javascript-object — NDM, Sep 25 '13 at 12:50
key/value pairs in JSON objects are specifically unordered. Use `for in` loop to access — devnull69, Sep 25 '13 at 12:51
I do not want a normal for loop since i need to something with the count — Hulk, Sep 25 '13 at 12:51
Could you clarify what "count" you're talking about and what it has to do with using or not using a for loop? — JJJ, Sep 25 '13 at 12:53
I am referring to count because i need to add elements dynamically which can be done only in this loop — Hulk, Sep 25 '13 at 12:57
Please show a larger context. It's almost certain that you can do whatever you want to do with a for..in loop as well. — JJJ, Sep 25 '13 at 12:58
You want to add elements to the object in a for loop that you want to use to list its key/value pairs? I don't understand .... — devnull69, Sep 25 '13 at 13:01

score 1 · Accepted Answer · answered Sep 25 '13 at 12:54

1

If you really need the count, define an external count variable and increment inside your for in loop:

var s     = {5: "456", 6: "123"},
    count = 0;

for (var key in s) {
    if (s.hasOwnProperty(key))
        console.log(s[key]);
    count++;
}

answered Sep 25 '13 at 12:54

tymeJV

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@Hulk -- What is the difference doing it your way or this? Both give the current index and both are set to stop at the Object keys' length. – tymeJV Sep 25 '13 at 12:58

score 1 · Answer 2 · answered Sep 25 '13 at 12:58

This is not "best practice", but as you are specifically looking for the for loop ...

s= {5: "456", 6: "123"} 
var count = Object.keys(s).length;
for (var j_cnt=0; j_cnt<count; j_cnt++) {
   var theKey = Object.keys(s)[j_cnt];
   var theValue = s[theKey];
}

Access JavaScript object elements by index

2 Answers2