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あまり知られていないRubyの便利機能

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Kazuhiro NishiyamaSoftware Developer

[鹿児島Ruby会議01](https://k-ruby.github.io/kagoshima-rubykaigi01/)での発表資料です。

あまり知られていないRubyの便利機能

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あまり知られていないRuby
の便利機能
Kazuhiro NISHIYAMA
鹿児島Ruby会議01
2019/11/30
株式会社Ruby開発
Powered by Rabbit 2.2.1
自己紹介
西山 和広
Ruby のコミッター
twitter, github など: @znz
株式会社Ruby開発 www.ruby-dev.jp
1/14
String#undump
String#dump ⇄ String#undump
since ruby 2.5
String#dump ≠ String#inspect
String#undump ≠ eval
2/14
Hash#transform_*
convert from Hash to Hash
Hash#transform_values{|v|...}
since ruby 2.4
Hash#transform_keys{|k|...}
since ruby 2.5
3/14
Hash#to_h with block
Hash#to_h{|k,v|...}
with block since ruby 2.6
without block since ruby 2.0.0
4/14
warn with uplevel:
old: warn "#{caller(1, 1)[0]}:
warning: message"
new: warn "message", uplevel: 1
since ruby 2.5
5/14
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あまり知られていないRubyの便利機能