34 lines
986 B
Markdown
34 lines
986 B
Markdown
|
---
|
||
|
|
title: Access Multi-Dimensional Arrays With Indexes
|
||
|
|
---
|
||
|
|
## Access Multi-Dimensional Arrays With Indexes
|
||
|
|
|
||
|
|
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
|
||
|
|
Consider the following multi-dimensional array:
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
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...
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var myNum = arr[2][1]; // Equal to 8
|
||
|
|
```
|
||
|
|
|
||
|
|
Or, if you want it to equal 1. You do...
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
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!
|