Elixir Keywords vs Maps in Pattern Matchin

wat.ex

defmodule Tester do
  def map(%{name: "Jason"} = options) do
    IO.puts "HI JASON"
  end

  def keywords([name: "Jason"] = options) do
    IO.puts "EXACTLY JASON"
  end
end

Tester.map(%{name: "Jason"}) #=> "HI JASON"
Tester.map(%{name: "Jason", age: 31}) #=> "HI JASON"

Tester.keywords([name: "Jason"]) #=> "EXACTLY JASON"
Tester.keywords([name: "Jason", age: 31])  #=>
#** (FunctionClauseError) no function clause matching in Tester.keywords/1
#    wat.ex:7: Tester.keywords([name: "Jason", age: 31])

Elixir allows partial matching on maps but not on keywords lists.

This example assumes that your functions would want to branch on a specific option but also pass the other options along.