Programming Elixir 1.2

Keyword Lists

Keyword lists are typically used in the context of options passed to functions.

maps/keywords.exs

defmodule Canvas do

  @defaults [ fg: "black", bg: "white", font: "Merriweather" ]

  def draw_text(text, options \\ []) do
    options = Keyword.merge(@defaults, options)
    IO.puts "Drawing text #{inspect(text)}"
    IO.puts "Foreground:  #{options[:fg]}"
    IO.puts "Background:  #{Keyword.get(options, :bg)}"
    IO.puts "Font:        #{Keyword.get(options, :font)}"
    IO.puts "Pattern:     #{Keyword.get(options, :pattern, "solid")}"
    IO.puts "Style:       #{inspect Keyword.get_values(options, :style)}"
  end

end

Canvas.draw_text("hello",