# 22 - Libraries

# Goals

• create your own library
• use library in different project

# why do we need to create libraries

# Useful links

Create your own library

• https://www.youtube.com/watch?v=3Xo6zSBgdgk
• https://www.youtube.com/watch?v=0OK5cGtUTt8

# Exercises 1

• create a simple phone number class with two static function one to validate mobile phone number and another one to generate random number

# Excersice 2

• lets make a library out of this class

# Excersice 3

• use the library that we created in a new project