Skip to Main Content
Mastering Elixir
book

Mastering Elixir

by André Albuquerque, Daniel Caixinha
July 2018
Intermediate to advanced content levelIntermediate to advanced
574 pages
14h 7m
English
Packt Publishing
Content preview from Mastering Elixir

Extending modules

After understanding how macros work, we will now apply the insights we just got to see how we can create macros that add functionality to the caller module. Our objective here is to create a macro, ElixirDrip.Chronometer.defchrono/2, equivalent to the existing def/2 macro but with the additional feature that logs how long the function call took.

Let's start by looking at the end result. We want to be able to define functions such as defchrono fun_name(arg1, arg2), do: ... and when we call the fun_name/2 function, it will tell us Took 123 µs to run SomeModule.fun_name/2. The following MeasuredModule will be our research subject:

$ cat examples/measured_module.exsdefmodule MeasuredModule do  import ElixirDrip.Chronometer defchrono_vn ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Testing Elixir

Testing Elixir

Andrea Leopardi, Jeffrey Matthias

Publisher Resources

ISBN: 9781788472678Supplemental Content