when conditions as functions

when_cond.exs

defmodule Hello do
  def hello(name,age) when is_kid(age) do
    IO.puts "Hello Kid #{name}"
  end
  def hello(name,age) when is_adult(age) do
    IO.puts "Hello Mister #{name}"
  end
  def is_kid age do
    age < 12
  end
  def is_adult age do
    age > 18
  end
end