gistfile1.ex

defmodule App do
  @x "123"
  @y "456"
  @z "789"

  def fx1 do
    for _ <- 1..100_000 do
      "#{@x}#{@y}#{@z}"
    end
  end

  def fx2 do
    for _ <- 1..100_000 do
      IO.iodata_to_binary([@x, @y, @z])
    end
  end

  def fx3 do
    for _ <- 1..100_000 do
      @x <> @y <> @z
    end
  end

  def time_of(function, args) do
    {time, result} = :timer.tc(function, args)
    IO.puts("Time: #{time}ms")
    # IO.puts("Result: #{result}")
  end
end

App.time_of(&App.fx1/0, [])
App.time_of(&App.fx2/0, [])
App.time_of(&App.fx3/0, [])