k-tsj

$ bin/ruby -v
ruby 2.4.0dev (2016-09-12 master 56141) [x86_64-linux]

$ bin/ri
ri 5.0.0.beta2

$ bin/ri String
= String < Object

------------------------------------------------------------------------------

k-tsj

module DidYouMean
  class MethodNameChecker
    prepend Module.new {
      PY2RB = {
        String => {
          lower: %i(downcase)
        },
        Object => {
          len: %i(obj.length)
        }

k-tsj

                                                                             user     system      total        real
Yhpg.new(actual).output == expect                                        0.210000   0.010000   0.220000 (  0.228040)
assert { Yhpg.itself.new(actual).output == expect }                      1.650000   0.000000   1.650000 (  1.650489)
assert { Yhpg.new(actual).output == expect }                           115.110000   0.000000 115.110000 (115.058014)

k-tsj

ruby -v -rstringio -rbenchmark -e 'N=1_000_000;Benchmark.bm(5){|x| x.report("String#<<"){s="";N.times{s<<"a"}}; x.report("Array#<<+join"){a=[];N.times{a<<"a"};a.join}; x.report("StringIO#<<"){i=StringIO.new;N.times{i<<"a"};i.to_s}};'
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
            user     system      total        real
String#<<  0.150000   0.000000   0.150000 (  0.149649)
Array#<<+join  0.200000   0.030000   0.230000 (  0.231170)
StringIO#<<  0.250000   0.010000   0.260000 (  0.255604)

k-tsj

diff --git a/lib/power_assert.rb b/lib/power_assert.rb
index 1a19d07..51064f1 100644
--- a/lib/power_assert.rb
+++ b/lib/power_assert.rb
@@ -5,7 +5,23 @@
 require 'power_assert/version'
 
 require 'ripper'
-require 'pattern-match'
+require 'pattern-match/core'

k-tsj

# power_assert.rb
#
# Copyright (C) 2014 Kazuki Tsujimoto, All rights reserved.
# License: BSDL
#
#   $ ruby power_assert.rb
#      "0".class == "3".to_i.times.map {|i| i + 1 }.class
#          |            |    |     |                |
#          |            |    |     |                Array
#          |            |    |     [1, 2, 3]

k-tsj

diff --git a/parse.y b/parse.y
index 3f756ce..680242d 100644
--- a/parse.y
+++ b/parse.y
@@ -10705,7 +10705,13 @@ rb_str_dynamic_intern(VALUE str)
     ID id, type;
 
     if (st_lookup(global_symbols.sym_id, str, &id)) {
-	return ID2SYM(id);
+	VALUE sym = ID2SYM(id);

k-tsj

require 'pattern-match'
require 'set'

module PatternMatch
  class PatternSetDeconstructor < PatternDeconstructor
    def initialize(klass, *subpatterns)
      super(*subpatterns)
      @klass = klass
    end

k-tsj

require 'pattern-match'

class Object
  def assert_pattern(pattern)
    match(self) do
      with(Kernel.eval(pattern, Kernel.binding)) { self }
    end
  end
end

k-tsj

require 'pattern-match'

class Module
  def check(pattern, mid)
    prepend Module.new {
      define_method(mid) do |*args|
        ret = super(*args)
        match(ret) do
          with(Kernel.eval(pattern, Kernel.binding)) { ret }
        end