freeCodeCamp Challenge Guide: Access Multi-Dimensional Arrays With Indexes

Access Multi-Dimensional Arrays With Indexes


Hints

Hint 1

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!

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