So I wanted to go over a couple built-in functions that really helped me increase the legibility of my code.

put_in/3: this is used to add in a key pair within a map, update_in/3 this is used to update a key pair within a map... So what is the big deal we have Map.put and Map.update...

put_in and update_in can use paths. This turns a nested Map.put into a single function call.

They follow a syntax as follows:
put_in(data, keys, value)
Where data can be as deep into a nested map as you want. 
users = %{"john" => %{age: 27}, "meg" => %{age: 23}}
put_in(users, ["john", :age], 28)

You can even change the value into a function, while using the update_in/3.

Now let's talk about Anonymous functions, because you can add in an anonymous function to the update_in/3 

update_in(users, ["jane", :age], &(&1 + 1))
Lets break this down
&(..) is setting up an anonymous function
&1 takes the first argument
+1 will add one

You can even use this to add an item to a list
&([new_item | &1]

Try to use these new functions to add more clean code to your elixir code.