# Generate a Countdown of Numbers in an Array
by Helen Yu
tags: arrays, loops

## Summary
> Create a function that takes a number as an argument and returns an array of numbers counting down from this number to zero.
> Examples
> countdown(5) ➞ [5, 4, 3, 2, 1, 0]
> countdown(1) ➞ [1, 0]
> countdown(0) ➞ [0]
> Notes
> The argument will always be greater than or equal to zero.

## Instructions
Create a function that takes a number as an argument and returns an array of numbers counting down from this number to zero.

### Examples
```
countdown(5) ➞ [5, 4, 3, 2, 1, 0]

countdown(1) ➞ [1, 0]

countdown(0) ➞ [0]
```

### Notes
The argument will always be greater than or equal to zero.