fetch-vs-fetch-with-block.rb

require "benchmark/ips"

HASH = { writing: :fast_ruby }
DEFAULT = "fast ruby"

Benchmark.ips do |x|
  x.report("Hash#fetch + const") { HASH.fetch(:writing, DEFAULT) }
  x.report("Hash#fetch + block") { HASH.fetch(:writing) { "fast ruby" } }
  x.report("Hash#fetch + arg")   { HASH.fetch(:writing, "fast ruby") }
  x.compare!
end