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!

Answer 1

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?

• Quintin Robinson: @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: Yes, and explain how you can write any program with zero globals.

Answer 2

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] = [];
}

Answer 3

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

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

Answer 4

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