sugamasao

package main

import (
	"io/ioutil"
	"log"
	"reflect"

	yaml "gopkg.in/yaml.v2"
)

sugamasao

pp Dir.children(File.join(Gem.dir, 'gems'))

sugamasao

# こんな感じでいけそうなんだけど、どうか
at_exit {
  path =  File.join(File.expand_path(__dir__))
  require_files = $LOADED_FEATURES.select{|f| f.start_with?(path)}
  files = Dir.glob("./**/*.rb").map{|f| File.expand_path(f)}.select{|f| f.start_with?(path)}
  diff = files - require_files
  puts "*** not required files(#{ diff.size }) ***"
  puts diff
}

sugamasao

irb(main):001:0> foo = {}
=> {}
irb(main):002:0> foo.default = "a"
=> "a"
irb(main):003:0> foo[:z]
=> "a"
irb(main):004:0> foo[:z].upcase!
=> "A"
irb(main):005:0> foo[:x]
=> "A"

sugamasao

# こんな感じでできそうだけど、内容があってるかは確認してない
Dir.glob(File.join(RbConfig.expand("$(libdir)"), 'ruby', "#{ RUBY_VERSION.split('.')[0, 2].join('.') }.0", "*.rb")).each do |path|
  name = File.basename(path, ".rb")
  next if %w(profile debug).include? name # こいつらをrequireするとプログラムが色々動いてしまうので除外
  require name
end

sugamasao

class StandardError
  def each_cause(&block)
    e = self
    while e
      yield e
      e = e.cause
    end
  end
end

sugamasao

for(let c of 'い𩸽あ😇'){
  console.log(c.charCodeAt(0).toString(16), c.charCodeAt(1).toString(16))
}

3044 NaN
d867 de3d
3042 NaN
d83d de07

sugamasao

# brew にあるのとXcodeとどっちをリンクしておくのが良いのだろうか（Xcodeの方がsymlinkなので汎用性ありそう）
% ls -l /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
total 0
drwxr-xr-x  5 root  wheel  160 11  3 12:39 MacOSX.sdk
lrwxr-xr-x  1 root  wheel   10  9 20 22:16 MacOSX10.13.sdk -> MacOSX.sdk

% bundle config build.nokogiri --use-system-libraries=true --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/libxml2

sugamasao

=begin
https://docs.ruby-lang.org/ja/latest/class/Exception.html#I_CAUSE

[START] -> foo error.
[FooError-0] : foo error. -> ["exception_sample.rb:19:in `rescue in run'", "exception_sample.rb:16:in `run'", "exception_sample.rb:37:in `<main>'"]
[BarError-1] : bar error. -> ["exception_sample.rb:9:in `rescue in run'", "exception_sample.rb:6:in `run'", "exception_sample.rb:17:in `run'", "exception_sample.rb:37:in `<main>'"]
[ZeroDivisionError-2] : divided by 0 -> ["exception_sample.rb:7:in `/'", "exception_sample.rb:7:in `run'", "exception_sample.rb:17:in `run'", "exception_sample.rb:37:in `<main>'"]
[END]
=end

sugamasao

irb(main):001:0> begin
irb(main):002:1*   raise ArgumentError, '何かエラー'
irb(main):003:1> rescue => e
irb(main):004:1>   puts "e.class = #{ e.class }"
irb(main):005:1>   puts "e.message = #{ e.message }"
irb(main):006:1> end
e.class = ArgumentError
e.message = 何かエラー
=> nil