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require 'benchmark/ips'
HASH = {
title: "awesome",
description: "a description",
author: "styd",
published_at: Time.now
}
HASH.dup.each{ |k, v| HASH[:"other_#{k}"], HASH[:"more_#{k}"] = v, v }
# Native implementation since v2.5
#
def fastest
HASH.slice(*%i[title author other])
end
# @ixti's faster implementation than that of ActiveSupport below
#
# Source:
# https://github.com/JuanitoFatas/fast-ruby/pull/173#issuecomment-470554483
#
def faster
memo = {}
%i[title author other].each { |k| memo[k] = HASH[k] if HASH.key?(k) }
memo
end
# ActiveSupport implementation of `slice` when it's not defined.
#
# Source:
# https://github.com/rails/rails/blob/01ae39660243bc5f0a986e20f9c9bff312b1b5f8/activesupport/lib/active_support/core_ext/hash/slice.rb#L24
#
def fast
%i[title author other].each_with_object({}){ |k, h| h[k] = HASH[k] if HASH.key?(k) }
end
def slow
keys = %i[title author other]
HASH.select { |k, _| keys.include? k }
end
Benchmark.ips do |x|
x.report('Hash#native-slice ') { fastest }
x.report('Array#each ') { faster }
x.report('Array#each_w/_object') { fast }
x.report('Hash#select-include ') { slow }
x.compare!
end
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