How to use array variable in array?

Question

I have an array and I want to put same array and other array inside of the first array.

var arr=["a","b","c",arr,arr2];
var arr2=["a","b"];

var arr3=[];
arr3=arr[3];

When I print out arr, I can see ["a","b","c",,]

But if I print out arr3, The result is undefined.

How can I fix it?

This can't possibly work. You're assigning arrays to other arrays before they even exist. — deceze
– deceze ♦, Commented Nov 11, 2014 at 5:35
arr is undefined when you're creating the array that will be assigned to arr. — sherb
– sherb, Commented Nov 11, 2014 at 5:35
The result is undefined because the variables are clearly not defined, no suprise there ! — adeneo
– adeneo, Commented Nov 11, 2014 at 5:36

sanchez · Accepted Answer · 2014-11-11 05:44:34Z

3

You need to do this in the right order:

var arr1 = [];
var arr2 = [ "a", "b" ];


// Now arr1 and arr2 are defined so you can throw them into another array:

var arr3 = [ "a", "b", "c", arr1, arr2 ];

edited Nov 11, 2014 at 5:44

answered Nov 11, 2014 at 5:37

sanchez

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Evan Knowles · Accepted Answer · 2014-11-11 05:35:58Z

1

You've defined arr as part of itself - arr[3] is arr. But at the time, arr doesn't exist yet, so it comes out as undefined.

answered Nov 11, 2014 at 5:35

Evan Knowles

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