Create array based on variable value with javascript - Stack Overflow

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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.

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.

• javascript

Share Improve this question Follow edited Jul 30, 2010 at 11:35 Brock Adams 93.7k2323 gold badges241241 silver badges305305 bronze badges asked Jul 30, 2010 at 7:51 peterpeter 6722 silver badges66 bronze badges 7

• 3 Is this homework? If so, please tag it as such. – Oded Commented Jul 30, 2010 at 7:55
• @Oded, Homework, in the middle of the summer? – Anders Commented Jul 30, 2010 at 7:55
• 2 @Anders - It is not summer in the south of our little globe, and not everyone in the world has summer vacation right now. Global munity and all, you know? – 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 Commented Jul 30, 2010 at 7:58
• 2 wait, people outside the US have internet? woah! – Anurag Commented Jul 30, 2010 at 8:01

 |  Show 2 more ments

4 Answers 4

Sorted by: Reset to default 4

var sizeOfArray = 6;

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

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)

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>

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/>");
}

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