create js array dynamically?

Question

how could I declare several js array dynamically? For example, here is what tried but failed:

 <script type="text/javascript">
 for (i=0;i<10;i++)
 {
   var "arr_"+i = new Array();
 }

Thanks!

Quintin Robinson · Accepted Answer · 2009-12-09 23:05:35Z

8

You were pretty close depending on what you would like to do..

<script type="text/javascript">
    var w = window;
     for (i=0;i<10;i++)
     {
       w["arr_"+i] = [];
     }
</script>

Would work, what is your intention for use though?

answered Dec 9, 2009 at 23:05

Quintin Robinson

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2 Comments

Quintin Robinson Over a year ago

@Tim Whitlock Perhaps you could elaborate on your statement and completely explain scope and preferred JS programming techniques to the OP for his simple question.

Kon Over a year ago

Yes, and explain how you can write any program with zero globals.

nickf · Accepted Answer · 2009-12-09 23:05:17Z

5

make it an array of arrays:

var arr = [];  // creates a new array .. much preferred method too.
for (var i = 0; i < 10; i++) {
    arr[i] = [];
}

answered Dec 9, 2009 at 23:05

nickf

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Comments

Kon · Accepted Answer · 2009-12-09 23:06:08Z

2

You can put them all into an array, like this...

var arrContainer = [];

 for (i=0;i<10;i++)
 {
   arrContainer.push(new Array());
 }

answered Dec 9, 2009 at 23:06

Kon

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Comments

Bubunyo Nyavor · Accepted Answer · 2018-10-31 21:20:44Z

0

Try [...new Array(10)]. It is short and handy.

answered Oct 31, 2018 at 21:20

Bubunyo Nyavor

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