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mito5525 / ruby kernel-array-vs-array-wrap
Last active Jan 14, 2020
Ruby Kernel.Array vs Array#wrap
View ruby kernel-array-vs-array-wrap
$ ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin18]
$ cat benchmark.yml
prelude: |
require 'active_support/core_ext/array/wrap'
a = nil
Kernel#Array(nil): Array(a)
Array#wrap(nil): Array.wrap(a)

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View instance_variables
~$ ruby -v
ruby 2.6.2p47 (2019-03-13 revision 67232) [x86_64-darwin18]
~$ irb
irb(main):001:0> class A
irb(main):002:1> attr_accessor :id, :name
irb(main):003:1> end
=> nil
irb(main):004:0> a =
=> #<A:0x00007fab848cdde0>
irb(main):005:0> a.instance_variables
mito5525 / struct_keyword_init.rb
Last active Jan 14, 2020
Ruby Struct new.tap vs keyword_init
View struct_keyword_init.rb
require 'benchmark_driver'
Benchmark.driver do |x|
x.prelude <<~RUBY
Hoge =
Fuga =, keyword_init: true)
i = 1
RUBY 'new_and_tap', %{ { |h| h.a = i } }
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