# Get the File Extension
by Helen Yu
tags: strings, higher_order_functions, arrays

## Summary
> Write a function that maps files to their extension names.
> Examples
> getExtension(["code.html", "code.css"])
> ➞ ["html", "css"]
> getExtension(["project1.jpg", "project1.pdf", "project1.mp3"])
> ➞ ["jpg", "pdf", "mp3"]
> getExtension(["ruby.rb", "cplusplus.cpp", "python.py", "javascript.js"])
> ➞ ["rb", "cpp", "py", "js"]
> Notes
> N/A

## Instructions
Write a function that maps files to their extension names.

### Examples
```
getExtension(["code.html", "code.css"])
➞ ["html", "css"]

getExtension(["project1.jpg", "project1.pdf", "project1.mp3"])
➞ ["jpg", "pdf", "mp3"]

getExtension(["ruby.rb", "cplusplus.cpp", "python.py", "javascript.js"])
➞ ["rb", "cpp", "py", "js"]
```

### Notes
N/A