Programming Elixir

Streams—Lazy Enumerables

In Elixir, the Enum module is greedy. This means that when you pass it a collection, it potentially consumes all the contents of that collection. It also means the result will typically be another collection. Look at the following pipeline:

The first map function takes the original list and creates a new list of its squares. with_index takes this list and returns a list of tuples. The next map then subtracts the index from the value, generating a list that gets passed to IO.inspect.

So, this pipeline generates four lists on its way to outputting the ...