freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/access-multi-dimensional-arrays-with-indexes/index.md

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Access Multi-Dimensional Arrays With Indexes

Access Multi-Dimensional Arrays With Indexes

Consider the following multi-dimensional array:

var arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]];

This is what it looks like in tabular form.

Position	0	1	2	3
0	1	4	7	10
1	2	5	8	11
2	3	6	9	12

Now all you have to do, is choose the coordinates of the data you desire! For examples, if we want myNum to equal 8, then...

var myNum = arr[2][1]; // Equal to 8

Or, if you want it to equal 1. You do...

var myNum = arr[0][0]; // Equal to 1

You first start off by choosing what column the number is in, then you choose the row. It's kind of like the x-y coordinate plane!