How to make a loop to create variable?

Question

Let's just say that I want variables who's content increase like this: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. But let's just say that I have variables that I want their names to increase like this: aaa, aab, aac, aad, aae, aaf, aag, aah, aai, aaj.

In other words, I want a loop that would create the following:

var aaa = 1;
var aab = 2;
var aac = 3;
var aad = 4;
var aae = 5;
var aaf = 6;
var aag = 7;
var aah = 8;
var aai = 9;
var aaj = 10;

Just saying, the idea in variable name part, is that once it reaches "aaz", it can go on to "aba", and the same when it reaches "azz", it would continue with "zaa".

So the javascript program itself will keep declaring variables in a loop? What are you trying to solve? — vsnyc
– vsnyc, Commented Apr 18, 2015 at 3:15
I don't see how this would be helpful as it's not like you could easily reference them. Either use an Array like Dyrandz said, or use an Object as a dictionary — Paul S.
– Paul S., Commented Apr 18, 2015 at 3:24
@DyrandzFamador @vsnyc @JamesWilkins @PaulS. I started using eval(). I could not do much with it though. I do not want to use either arrays or objects, I would like something that can create variables to the var object/array(whatever it is). — Julian Avar
– Julian Avar, Commented Apr 18, 2015 at 4:16

James Wilkins · Accepted Answer · 2015-04-18 03:49:44Z

4

Here's one way you can do it:

var s = ""; 
for (var i = 0, s = ""; i < 26; ++i)
    for (var i2 = 0; i2 < 26; ++i2)
        for (var i3 = 0; i3 < 26; ++i3)
            s += "var " + String.fromCharCode(97+i) + String.fromCharCode(97+i2) + String.fromCharCode(97+i3) + " = " + (i*26*26+i2*26+i3)+";\r\n";

You can create all variables all at once by calling eval(s).

Warning though: Some letter combos are KEYWORDS (as in var new = 8914; is an error), and eval() will fail if you are planning to do it this way. Instead, you should set the values on an object like this:

function createVariables(obj) {
    for (var i = 0, s = ""; i < 26; ++i)
        for (var i2 = 0; i2 < 26; ++i2)
            for (var i3 = 0; i3 < 26; ++i3)
                obj[String.fromCharCode(97+i) + String.fromCharCode(97+i2) + String.fromCharCode(97+i3)] = i*26*26+i2*26+i3;
    return obj;
}

var vars = createVariables({});

You will have a total of 26*26*26, or 17576 variables.

edited Apr 18, 2015 at 3:49

answered Apr 18, 2015 at 3:34

James Wilkins

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2 Comments

Rick Hitchcock Over a year ago

Nice catch on the reserved words. It would certainly hiccup on var var = ...

Julian Avar Over a year ago

This is the closest to what I expected

bhagya · Accepted Answer · 2015-04-18 04:26:00Z

2

I think it may help you

var cars = ["a", "b", "c", "d"];
var count=1;
var text=new Array() ;
for (var i = 0 ; i < cars.length; i++) {
    for (var j = 0 ; j < cars.length; j++){
        for (var k = 0 ; k < cars.length; k++){
            text.push([cars[i]+cars[j]+cars[k],count]);
            count++;
        }
    }
}
for (var i = 0 ; i < text.length; i++) {
    document.write(text[i][0]+'---'+text[i][1]+'<br>');
}

answered Apr 18, 2015 at 4:26

bhagya

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