https://schmitty.me/ Recent content on Cory Schmitt Hugo -- gohugo.io en-us Sun, 06 Jan 2019 11:41:07 -0800 https://schmitty.me/posts/deriving-protocols-in-elixir/ Sun, 06 Jan 2019 11:41:07 -0800 https://schmitty.me/posts/deriving-protocols-in-elixir/ Using derive to implement a protocol is a quick way to give functionality to your modules. Let’s say you had a protocol that rounds values for you. Like such: defprotocol Math do def round(v, p) end defimpl Math, for: Float do defdelegate round(v, p), to: Float end Which allows us to do something like this: iex(1)> Math.round(1.556, 2) 1.56 Now say we wanted to round all the float values in our custom data structures. https://schmitty.me/posts/collecting-comprehensions-in-elixir/ Sun, 16 Dec 2018 09:15:32 -0800 https://schmitty.me/posts/collecting-comprehensions-in-elixir/ Comprehensions are an elegant way to loop through enumerables, and are especially powerful when the enumerable is heavily nested. Paired with the Collectable protocol they are absolutely fantastic. Let’s walk through doing just that. @data [ %{ 1 => [ %{ 1 => %{ line_items: [ %{ id: 1, to_state: "NJ", unit_price: 101, quantity: 2 }, %{ id: 1, to_state: "NJ", unit_price: 50, quantity: 2 } ] } } ] }, %{ 2 => [ %{ 1 => %{ line_items: [ %{ id: 1, to_state: "CA", unit_price: 101, quantity: 2 }, %{ id: 2, to_state: "NJ", unit_price: 201, quantity: 3 } ] } } ] } ] Here is the data structure we are going to use. https://schmitty.me/posts/how-to-behave-and-why/ Sun, 25 Nov 2018 13:58:02 -0800 https://schmitty.me/posts/how-to-behave-and-why/ Using behaviours in elixir is a great way to define how a module act. They are also used a lot when doing polymorphism, but there are a few best practices that are not apparent when taking this approach. Lets go over them. Lets implement a simple behaviour to give us some context. defmodule Calculator do @callback add(number(), number()) :: number() end defmodule Calc.Base10 do @behaviour Calculator @impl true def add(x, y), do: x + y end We’ve created a simple behaviour and implemented its only callback; the add function. https://schmitty.me/pages/about/ Sun, 25 Nov 2018 13:48:10 -0800 https://schmitty.me/pages/about/ I am a Software Engineer currently working remotely for TaxJar specializing in Elixir.