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@cheerfulstoic
Last active July 17, 2021 11:34
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defmodule Tester do
def update!(map) do
try do
{:ok, Map.update!(map, :blah, fn v -> v end)}
rescue
e in KeyError -> {:error, :no_key}
end
end
def update(map) do
{:ok, Map.update(map, :blah, %{a: 1}, fn v -> v end)}
end
def check_and_update!(map) do
if Map.has_key?(map, :blah) do
{:ok, Map.update!(map, :blah, fn v -> v end)}
else
{:error, :no_key}
end
end
end
with_key = %{:blah => 1}
without_key = %{}
Benchee.run(%{
"check_and_update! - key exists" => fn -> Tester.check_and_update!(with_key) end,
"update! - key exists" => fn -> Tester.update!(with_key) end,
"update - key exists" => fn -> Tester.update(with_key) end,
"check_and_update! - key does not exist" => fn -> Tester.check_and_update!(without_key) end,
"update! - key does not exist" => fn -> Tester.update!(without_key) end,
"update - key does not exist" => fn -> Tester.update(without_key) end,
})
Name ips average deviation median 99th %
check_and_update! - key does not exist 31.67 M 31.57 ns ±1173.96% 0 ns 990 ns
update - key does not exist 10.53 M 94.96 ns ±30972.53% 0 ns 990 ns
update - key exists 10.02 M 99.81 ns ±33800.81% 0 ns 990 ns
check_and_update! - key exists 9.98 M 100.18 ns ±26534.11% 0 ns 990 ns
update! - key exists 6.98 M 143.30 ns ±23903.76% 0 ns 990 ns
update! - key does not exist 1.60 M 625.12 ns ±1441.31% 990 ns 1990 ns
Comparison:
check_and_update! - key does not exist 31.67 M
update - key does not exist 10.53 M - 3.01x slower +63.38 ns
update - key exists 10.02 M - 3.16x slower +68.24 ns
check_and_update! - key exists 9.98 M - 3.17x slower +68.61 ns
update! - key exists 6.98 M - 4.54x slower +111.73 ns
update! - key does not exist 1.60 M - 19.80x slower +593.55 ns
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