Create array based on variable value with javascript

Question

I have a variable with a dynamic value (from 1 to 15). Depending on the value of the variable, I want to create an array with the same length.

And, if for example the variable value is 1, I want to store A in the array, if the value is 6 I want to store A,B,C,D,E,F in the array and so on.

How do I achieve this? Thanks in advance.

@Anders - It is not summer in the south of our little globe, and not everyone in the world has summer vacation right now. Global community and all, you know? — Oded
– Oded, Commented Jul 30, 2010 at 7:58
Well, I am in Australia and it's winter here. No, it's not homework, thanks. — peter
– peter, Commented Jul 30, 2010 at 7:58

Anurag · Accepted Answer · 2010-07-30 07:59:06Z

4

var sizeOfArray = 6;

"ABCDEFGHIJKLMNO".slice(0, sizeOfArray).split('');
// ["A", "B", "C", "D", "E", "F"]

answered Jul 30, 2010 at 7:59

Anurag

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5 Comments

peter Over a year ago

Thanks Anurag, so where do I create the array?

Anurag Over a year ago

The second statement returns an array. The split function is doing that for you.

bezmax Over a year ago

Well, he only mentioned an idea, not the full solution (nice idea btw). The full solution would be: var sizeOfArray=6; var newArray = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".slice(0, sizeOfArray).split('');

peter Over a year ago

so the name of the array will be sizeOfArray?

bezmax Over a year ago

No, my comment creates a variable "newArray". Original post has no variable with array. There are no line-breaks in comments so I had to put it in 1 line.

vipulgupta2048 · Accepted Answer · 2024-07-31 09:34:29Z

1

var arrSize = 4;
var myArray = new Array(arrSize);

or you can declare the array without size and then push a new element in it:

var myArray = new Array();
myArray.push(ITEM);

where ITEM is replaced by a variable or string or number you want to add in the array (will be added at the end of the array)

edited Jul 31, 2024 at 9:34

vipulgupta2048

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answered Jul 30, 2010 at 8:02

o15a3d4l11s2

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Comments

Peter · Accepted Answer · 2010-07-30 08:22:16Z

0

My 2 cents. (this function takes size > 26 into account)

<script type="text/javascript">
    function buildAlphabetArray(size) {
        var range = 26;
        var arr = new Array();
        for (var i = 0; i <= parseInt(size); i++) {
            //calculate current index (recalc to number between 0 and range)
            var j = (i < (range-1) ? i : (i - range * parseInt(i / range))); 
            //get the char value of ascii 65 + index (charAt(65)==A)
            arr[i] = String.fromCharCode(j + 65); //
        }
        //test
        //alert(arr.join(""));
        return arr;
    }
</script>

answered Jul 30, 2010 at 8:22

Peter

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Comments

bezmax · Accepted Answer · 2010-07-30 07:58:42Z

0

var a = 5;

var arr = new Array(a);
for (var i = 0;i<a;i++) {
    arr[i] = String.fromCharCode(65+i);
    document.write("arr["+i+"] = '"+arr[i]+"'<br/>");
}

answered Jul 30, 2010 at 7:58

bezmax

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