benchmark_map_vs_pattern_matching.ex

defmodule Mod do
  @table %{
    a: 1, b: 2, c: 3, d: 4, e: 5,
    f: 6, g: 7, h: 8, i: 9, j: 0,
  }

  def fun1(k) do @table[k] end

  for {k, v} <- @table do
    def fun2(unquote(k)) do unquote(v) end
  end
end


defmodule BasicBench do
  use Benchfella

  bench "map" do
    1..10_000 |> Enum.each(fn _ ->
          Mod.fun1(:a); Mod.fun1(:b); Mod.fun1(:c); Mod.fun1(:d); Mod.fun1(:e);
          Mod.fun1(:f); Mod.fun1(:g); Mod.fun1(:h); Mod.fun1(:i); Mod.fun1(:j)
        end)
  end

  bench "pattern matching" do
    1..10_000 |> Enum.each(fn _ ->
          Mod.fun2(:a); Mod.fun2(:b); Mod.fun2(:c); Mod.fun2(:d); Mod.fun2(:e);
          Mod.fun2(:f); Mod.fun2(:g); Mod.fun2(:h); Mod.fun2(:i); Mod.fun2(:j)
        end)
  end
end


# Settings:
#   duration:      1.0 s

# ## BasicBench
# [11:13:14] 1/2: map
# [11:13:16] 2/2: pattern matching

# Finished in 4.24 seconds

# ## BasicBench
# benchmark name    iterations   average time 
# pattern matching        1000   1459.69 µs/op
# map                      200   8446.38 µs/op