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Documentation:
https://hexdocs.pm/elixir/modules-and-functions.html
Course content
0:00 - Intro
0:30 - Creating the Users module
1:55 - Naming convention for modules
3:32 - Creating a function
4:38 - Implicit return
6:17 - iex -S mix (running the entire application on iex)
7:21 - Adding function parameters
8:34 - Function arity
9:21 - What makes a function unique?
11:12 - Private functions
13:47 - Defining a function in 1 line
