Creating a javascript variable using another variable as a counter

Question

Say I want something like this:

var i = 0;

for (i upto 100) {
    var x+i = "This is another variable altogether";
    i++;
}

The javascript interpreter would see:

var x = "This is another variable altogether";
var x1 = "This is another variable altogether";
var x2= "This is another variable altogether";
var x3 = "This is another variable altogether";
var x4 = "This is another variable altogether";

Can I use a variable counter to increment the name of the variable so I have distinct variables altogether?

Why not use an associative array instead?

user1233508
– user1233508

2012-11-20 15:19:37 +00:00
Commented Nov 20, 2012 at 15:19 — user1233508
– user1233508, Commented Nov 20, 2012 at 15:19

gen_Eric · Accepted Answer · 2012-11-20 15:22:12Z

6

Technically, yes.

If you're operating in the global scope which I suspect you are, you can do this:

for (var i=0; i<100; i++){
  window["x"+i]="This is another variable altogether";
}

console.log(x1);

You should however be doing this kind of thing with an array, so:

var arr=[];
for (var i=0; i<100; i++){
  arr[i]="This is another variable altogether";
}

console.log(arr[1]);

edited Nov 20, 2012 at 15:22

gen_Eric

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answered Nov 20, 2012 at 15:21

Doug

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Comments

Michał Miszczyszyn · Accepted Answer · 2012-11-20 15:19:50Z

1

You should not use distinct variables for that. Give a try to Array:

var arr = [];
...
arr.push('my var');

or object:

var ob = {};
...
ob[counter] = 'my var';

answered Nov 20, 2012 at 15:19

Michał Miszczyszyn

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3 Comments

gen_Eric Over a year ago

Instead of arr[arr.length] use arr.push().

Michał Miszczyszyn Over a year ago

True that, I thought I read somewhere arr[arr.length] is faster but it seems it's not. Edited.

gen_Eric Over a year ago

It wasn't concerned with speed, I just figured a.push is less confusing.

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