On: Elixir v1.1.0 Released

[totallymike]

It's a macro. It takes the result of the prior operation and inserts it as the first parameter of the next operation.

More or less it rewrites

    String.downcase("FOO\0BAR") |> String.split("\0")

to

    String.split(String.downcase("FOO\0BAR"), "\0")