Elixir v1.18.0-rc.0 released!

[NewsBot]

Elixir v1.18.0-rc.0 has been released.

Elixir v1.18 is an impressive release with improvements across the two main efforts happening within the Elixir ecosystem right now: set-theoretic types and language servers. It also comes with built-in JSON support and adds new capabilities to its unit testing library. Here is a quick break down.

Type system improvements

The most exciting change in Elixir v1.18 is type checking of function calls, alongside gradual inference of patterns and return types. To understand how this will impact your programs, consider the following code:

defmodule User do
  defstruct [:age, :car_choice]

  def drive(%User{age: age, car_choice: car}, car_choices) when age >= 18 do
    if car in car_choices do
      {:ok, car}
    else
      {:error, :no_choice}
    end
  end

  def drive(%User{}, _car_choices) do
    {:error, :not_allowed}
  end
end

Elixir’s type system will infer the drive function expects a %User{} struct as input and returns either `{:ok,…

Link: Release v1.18.0-rc.0 · elixir-lang/elixir · GitHub