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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 } if RUBY_VERSION >= '2.5.0'

x.report('Array#each ') { faster }

x.report('Array#each_w/_object') { fast }

x.report('Hash#select-include ') { slow }

x.compare!

end