Rubyを説明するのは難しい(仮) / ruby is difficult

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RubyΛઆ໌͢Δͷ͸ ೉͍͠ʢԾʣ ͱͪ͗Rubyձٞ08(2019/6/29) sugamasao@gmail.com

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RubyΛઆ໌͢Δͷ͸ ೉͍͠ ͱͪ͗Rubyձٞ08(2019/6/29) sugamasao@gmail.com ʢϓϩάϥϜΛڭ͑Δ࣌ʹʣ

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ͱ͜ΖͰͩΕʁ • HN sugamasao • PN ͕͢ΘΒ·͞ͷΓ • Rubyྺ 13೥͘Β͍(…!!) • Rails͸ͦΜͳʹಘҙͰ͸ͳ͍ • Rubyʹؔ͢ΔΛ͍͔ͭ͘✍͠·ͨ͠

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ࣥචྺ 2013 ύʔϑΣΫτRuby(ڞஶ) 2014 WebΞϓϦΤϯδχΞཆ੒ಡຊ(ڞஶ) 2014 ύʔϑΣΫτRuby on Rails(ڞஶ) 2017 վఆ2൛ ύʔϑΣΫτRuby(ڞஶ) 2018 ͔ΜͨΜRuby(୯ஶ) 2019 ???

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͔ΜͨΜRubyࣥචͷࡍʹ೉͠ ͍ͳʙͱࢥͬͨ෦෼ͱɺ࠷ऴత ʹͲ͏͍͏આ໌ʹͳ͔ͬͨΛղ આͯ͠ɺօ͞Μͷࠓޙͷࢀߟʹ ͳΔͱྑ͍ͳͱࢥ͍·͢ ͜͏͍͏આ໌Ͱ͏·͍ͬͨ͘Αʂͱ͍͏͓ ࿩Λ͓࣋ͪͷํ͸৭ʑڭ͍͑ͯͩ͘͞

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͔ΜͨΜRuby ͱ͸ʁ

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͔ΜͨΜRuby lຊॻ͸ɼʮ޿͘ɾਖ਼͘͠ɾ৽͘͠ʯΛ ίϯηϓτʹ3VCZͰϓϩάϥϛϯάΛ ͸͡ΊΔʹ౰ͨͬͯجຊతͳ͜ͱ͸͢΂ ֶͯशͰ͖Δ಺༰ͱͳ͍ͬͯ·͢ɻ ʢҎԼུʣz https://gihyo.jp/book/2018/978-4-7741- 9861-3 “͔ΜͨΜγϦʔζ”ͷRuby൛

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͍ΘΏΔ ೖ໳ॻ

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ࣥචςʔϚ • ଞͷݴޠͷ஌͕ࣝͳͯ͘΋Rubyͷجຊ͕Θ͔Δ • RubyͷϦϑΝϨϯεϚχϡΞϧΛಡΊΔΑ͏ʹͳΔ • ࣮ࡍʹ࢖ΘΕΔίʔυ͕Rubyͷίʔυͱͯ͠ಡΊΔ  ʢ͋Δ͍͸ௐ΂ΒΕΔʣΑ͏ʹͳΔ

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ଞͷݴޠͷ஌͕ࣝͳͯ͘΋ Rubyͷجຊ͕Θ͔Δ

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ଞͷݴޠͷ஌͕ࣝͳͯ͘΋Rubyͷجຊ͕Θ͔Δ ·͋ೖ໳ॻͳͷͰɾɾɾ hogeݴޠͷ֓೦͸RubyͰݴ͏ͱ͜͏ͩΑʂ Ͱ͸ͳ͘ɺϓϩάϥϛϯάͱͯ͠ͷجຊΛ཈͑ ΒΕΔΑ͏ʹ : https://magazine.rubyist.net/articles/0001/0001-Hotlinks.html

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RubyͷϦϑΝϨϯεϚχϡΞϧ ΛಡΊΔΑ͏ʹͳΔ

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RubyͷϦϑΝϨϯεϚχϡΞϧΛಡΊΔΑ͏ʹͳΔ ͜ͷ఺͸ҟৗʹͩ͜Θ͍ͬͯͯɺຊॻͰ ղઆ͢Δͱ͖ϦϑΝϨϯεϚχϡΞϧͷ ϦϯΫΛ͚͍ͭͯΔ ʢϦϑΝϨϯεϚχϡΞϧͷಡΈํ͔Βղઆ͕͋Δκʣ ʢ૊ΈࠐΈϥΠϒϥϦͱඪ४ఴ෇ϥΠϒϥϦͱ͔͍ܰॳݟࡴ͠ ͩ͠……ʣ : ࡞ͬͯΈ͍ͨ΋ͷ͕ࢥ͍͍ͭͯ΋ௐ΂ํ͕Θ͔Βͳ͍ͱͲ͏ʹ΋ͳΒ ͳ͍ͷͰɺ࠷΋ॏཁͳ఺ͩͱߟ͍͑ͯ·͢

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࣮ࡍʹ࢖ΘΕΔίʔυ͕ಡΊΔ

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࣮ࡍʹ࢖ΘΕΔίʔυ͕ಡΊΔ ૉ๿ͳղઆʹऴ࢝ͯ͠͠·͏ͱɺ%ه๏ͷΑ͏ͳ આ໌༏ઌ౓ͱͯ͠͸௿͍ʢ͋Ε΋͜Ε΋ͱઆ໌͢Δͱ࿩͕ൃࢄ͠ ͪΌ͏ͷͰʣ͚Ͳ࣮ίʔυͰ͸;ͭ͏ʹग़ͯ͘ΔɺΈͨ ͍ͳ΋ͷ͸Ͳ͏ʹ͔ͯ͠ղઆ͍ͯ͋͛ͨ͠ ຊΛಡΜͰ͍Δ࣌఺Ͱ͖ͪΜͱཧղͰ͖ͳͯ͘΋ ʮ஌ͬͯʯ͍Ε͹ʮௐ΂ʯΒΕΔ͸ͣͳͷͰ

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ͱ͜ΖͰ

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ೖ໳ॻͱݴͬͯ΋ ର৅ಡऀϨϕϧʹΑͬͯ ੾Γޱ͸ҟͳΓ·͢

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https://speakerdeck.com/igaiga/dive-into-code-rails-ruby-books?slide=10 @igaiga555͞ΜʹΑΔ࠷ۙͷॻ੶ͷ෼ྨ

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͔ΜͨΜRuby͸ ʮଞݴޠܦݧ͋Γʯ ͷதͰ͸ϏΪφʔ޲͚

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……ͱ͍͏Ϩϕϧײʹ͍ͭͯ ղઆΛ࡞͍ͬͯͨͷͰ͕͢ɺ ΑΓత֬ͳจষʹग़ձͬͨͷ ͰҾ༻͠·͢Ͷ

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Matz͞ΜʹΑΔΦεεϝ https://jp.quora.com/ Ruby%E8%A8%80%E8%AA%9E%E3%82%92%E5%AD%A6%E3%81%B3%E5%A7%8B%E3%82%81%E3%82%8 B%E3%81%AE%E6%99%82%E3%81%AB%E4%B8%80%E7%95%AA%E3%82%AA%E3%82%B9%E3%82%B9% E3%83%A1%E3%81%AE%E6%9B%B8%E7%B1%8D%E3%81%AF%E3%81%A9%E3%82%8C ͍͢͝త֬!!!

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ʢ౜ಥʣ RubyΛଞͷਓʹ ڭ͑Δͷͬͯ ೉͘͠ͳ͍Ͱ͔͢ʁ

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ϜζΧγΠφʔͱ ࢥͬͨ͜ͱ͕͋Δਓ ʢ໰͍͕ࡶ͗͢·͢Ͷʣ

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ͳΔ΄Ͳʙ

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ຊ୊

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࣍ͷίʔυΛݟͯ ࡞ऀͷؾ࣋ͪΛ ߟ͑Α ※కΊ੾ΓͷϓϨογϟʔ΍ࣥච͕πϥ͍ͳͲ͸ৗ࣌ ൃಈ͍ͯ͠ΔͷͰɺ͜͜Ͱ͸ߟ͑ͳ͍΋ͷͱ͢Δ

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໰ Hello, world!ͷαϯϓϧίʔυΛ ղઆ͍ͨ͠ puts "Hello, world!"

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࡞ऀͷߟ͑ hogeݴޠʹൺ΂ͯγϯϓϧʹॻ͚ΔΑʢͱݴ͍ ͍͕ͨΠϚυΩͦΕΛϝϦοτͱ͢Δ͔ʁʣ putsϝιουΛ࢖ͬͯจࣈྻΛग़ྗ͢ΔΑ Kernelʹఆ͍ٛͯ͠Δϝιουͩؔ͠਺෩ϝ ιουͬͯݴͬͨํ͕ྑ͔ͬͨΓ͢Δͷ͔ͳ ͦ΋ͦ΋Ϩγʔόͷͳ͍ϝιουӠʑͷઆ໌Α ͍΍͍΍ɺͦ΋ͦ΋putsϝιουͬͯԿͩΑ w w w w ࠓͷஈ֊Ͱͦ͜·Ͱݴ͏ඞཁͳ͍ɺৄࡉΛઆ໌ ͤͣʹ఻͑ͳ͍ͱͩ

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ຊॻͷ౴͑ ͜͏ͳΔ P24

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ຊॻΛॻ্͘Ͱ ߟ͍͑ͯͨॏཁ ͳϙΠϯτ✅

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ղઆΛ͢Δ্Ͱ ՄೳͳݶΓ Ұͭͷ͜ͱΛઆ໌ ͍ͨ͠

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͔͠͠ɺલఏ஌ࣝ ͷੵΈॏͶ΍΢ι ͷͳ͍γϯϓϧͳ આ໌Λ͢Δͷ͸ ͱͯ΋೰·͍͠

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ྫ͑͹

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Rubyʹؔ͢Δઆ໌Λ؆୯ͳ ಺༰͔Βॱংཱͯઆ໌͢Δ ͷ೉͍͠໰୊

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Rubyʹؔ͢Δઆ໌Λॱংཱͯߟ͑Δ • ΠϯτϩμΫγϣϯ • จࣈྻ΍਺஋ʹ͍ͭͯͷղઆ • ੍ޚߏจʹ͍ͭͯ • ഑ྻʹ͍ͭͯ  :

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• ΠϯτϩμΫγϣϯ • จࣈྻ΍਺஋ʹ͍ͭͯͷղઆ • ੍ޚߏจʹ͍ͭͯ • ഑ྻʹ͍ͭͯ  : Rubyʹؔ͢Δઆ໌Λॱংཱͯߟ͑Δ

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puts "Hello, world!" puts 1 + 1  puts "#{10 * 2}" ͜͜Βล͸ฏ࿨

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puts "Hello, world!".upcase 3.times do |n| puts “=> #{n}” end ్୺ʹݫ͘͠ͳΔ

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puts "Hello, world!".upcase 3.times do |n| puts “=> #{n}” end ్୺ʹݫ͘͠ͳΔ !? !? !? !?

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• ϝιου • ʹΫϥεͷઆ໌͕ඞཁ • ϒϩοΫ • ϒϩοΫҾ਺ ్୺ʹݫ͘͠ͳΔ

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͜ΕΒͷػೳΛ จࣈྻ΍਺஋ͷ͍ͭͰʹ આ໌͢ΔΘ͚ʹ͸͍͔ͳ͍

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ಥવ͜ΕΒͷઆ໌Λ࢝ΊͨΒ “ύϧεͷϑΝϧγͷ ϧγ͕ίΫʔϯͰύʔδ” Έ͍ͨʹͳΔ

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Ͱ͸Ͳ͏͢Δ͔

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……

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……

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ʢૂ͍ͱͯ͠ʣΦϒδΣΫτࢦ޲ʹ ͍ͭͯղઆ͢Δͱ͍͏ΑΓ͸ ”ΦϒδΣΫτ”΍”ϝιου”ͳͲͷ ֓೦͕͋Δ͜ͱΛ஌͍ͬͯͯ΄͍͠

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ʰ͜ͷੈքʱͰ͸ͦʔ͍͏΋ͷ ͩͱʰཧղʱͯ͠΋Β͏

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Rubyʹؔ͢Δઆ໌Λ؆୯ͳ ಺༰͔Βॱংཱͯઆ໌͢Δ ͷ೉͍͠໰୊ ऴΘΓ

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ϓϩάϥϜతͳҙຯͰΫϥε ͷઆ໌͕೉͍͠໰୊

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ࣗ෼ͰΫϥεΛఆٛ͢Δ·Ͱ͸ ૉ๿ͳੈք ϩʔΧϧม਺Λ࢖͍ɺ૊ΈࠐΈϥΠϒϥϦͱ ༡ΜͰ฻Β͍͚ͯ͠Δ

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Ϋϥεͷఆٛํ๏Λ஌Δͱಥવ ੈք͕։͚͗͢Δ໰୊

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• Πϯελϯεม਺ • Ϋϥεม਺ • ϩʔΧϧม਺  ʢࠓ·ͰԿؾͳ͘࢖͍ͬͯͨม਺ͷਖ਼ମʣ • self Ξοϓ࢝͠ΊΔม਺ͨͪ

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• ΠϯελϯεԽ • Πϯελϯε/Ϋϥεϝιου • ϝιουͷՄࢹੑ • ΞΫηοαϝιου • ܧঝ • Etc Ϋϥεʹ·ͭΘΔػೳͨͪ

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ͪΐͬͱઆ໌͢Δ͜ͱଟ͗͢΍ ͠ͳ͍͔Ͷʁ

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Ͳ͏΍ͬͯઆ໌͢Δ͔ɺɺɺ

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ɺɺɺ

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ؤுͬͯઆ໌͢Δ͔͠ͳ͍

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“ʮҰ൪ͷۙಓ͸ԕճΓͩͬͨʯ ʮԕճΓ͕ͦ͜Զͷ࠷୹ͷಓͩͬͨʯ” -δϟΠϩɾπΣϖϦ-

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Ͳ͏ݟͯ΋͜ͷষ͚ͩେมͳϘ ϦϡʔϜͰ͢ɻຊ౰ʹ͋Γ͕ͱ ͏͍͟͝·ͨ͠

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ϓϩάϥϜతͳҙຯͰΫϥεͷઆ ໌͕೉͍͠໰୊ ऴΘΓ

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;ͭʔʹઆ໌͢Δͱऄ଍ͬΆ͘ͳ Δ͚ͲͲ͏ͯ͠΋આ໌͍ͨ͠ ʢͷͰઆ໌ͨ͠ʣػೳ/࢓૊Έ ͦͷଞ

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จࣈίʔυ ࠓͷRuby͸σϑΥϧτΤϯίʔσΟϯά΋ UTF-8ͷ࣌୅ͳͷͰ;ͭ͏ʹ࢖͏෼ʹ͸ࠔΒͳ͍ ͔͠͠ɺCSV<->Excelͷѻ͍΍ૉ௚ʹ࡞ΒΕͨ Windows࢈ςΩετϑΝΠϧͳͲɺ༉அ͢Δͱ UTF-8Ҏ֎ͷ΋ͷʹग़ձ͏͜ͱ΋͋Δ

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จࣈίʔυ

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array.map(&:upcase)ͷΞϨ ϒϩοΫΛলུͯ͠&:methodΛ౉͢΍ʔͭ ਖ਼௚ɺೖ໳ॻͷϨϕϧײͱͯ͠͸ͪΌΜͱͨ͠ આ໌Λ͢Δʹ͸೉͍͠ʢ΍΍͍͜͠ʣ͚Ͳɺ ࣮ίʔυͰ͸;ͭ͏ʹ࢖ΘΕΔ΋ͷͳͷͰ આ໌͠ͳ͍Θ͚ʹ΋͍͘·͍

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array.map(&:upcase)ͷΞϨ

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;ͭ͏ʹࠔͬͨ࿩

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γϯϘϧͷઆ໌ Ή͔ͣ͗͢͠Ο!!

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จࣈྻΈ͍͚ͨͩͲจࣈྻ͡Ό ͳͯࣝ͘ผࢠʢࣝผࢠͱ͸ʣ తʹ࢖͏ΜͩΑɺΈ͍ͨͷΛͳ Μͱͳ͘Θ͔ͬͨؾʹͳΔΑ͏ ͳઆ໌Λ͠ͳͯ͘͸͍͚ͳ͍ͩ ͱʁʁʁ

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ΨνͰࠔ͍ͬͯΔͷͰࡓ͑ͨઆ໌ ͷ࢓ํ͕͋Ε͹ڭ͍͑ͯͩ͘͞!!1

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͓΋͠Ζ͔ͬͨΒ ྑ͍δϟϯʂͯ͠Ͷʂʢʁʁʁʣ ࠷ޙʹ ʮೖ໳ॻΛॻ͘ͷɺͲ͏ʹ͔ͳΔ΍Ζʯͱܰ͘ ߟ͍͑ͯͨΒࢮ͵΄ͲେมͰͨ͠ օ͞Μ΋ղઆͰۤ࿑ͨ͠఺΍޻෉͍ͯ͠Δ఺͕ ͋Ε͹ͥͻڭ͍͑ͯͩ͘͞☺

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ࢀߟจݙ • ͔ΜͨΜRuby • https://gihyo.jp/book/2018/978-4-7741-9861-3 • θϩ͔ΒΘ͔Δ Ruby ௒ೖ໳ • https://gihyo.jp/book/2018/978-4-297-10123-7 • Ruby͓ΑͼRailsॻ੶ͷ෼ྨͱҰߟ࡯ • https://speakerdeck.com/igaiga/dive-into-code-rails-ruby-books • Rubyist Hotlinks ʲୈ 1 ճʳ ·ͭ΋ͱΏ͖ͻΖ͞Μ • https://magazine.rubyist.net/articles/0001/0001-Hotlinks.html • RubyϦϑΝϨϯεϚχϡΞϧ • https://docs.ruby-lang.org/ja/latest/doc/index.html

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͕࣌ؒ༨ͬͨ༻ ॻ੶Λࣥච͢Δͱɺվϖʔδͷ౎߹Ͱ༨ന͕ଟ ͘ͳͬͯ͠·͏৔߹͕͋Γ·͢ ͜ͷΑ͏ͳ࣌ɺίϥϜͰຒΊͯ͘ΕʙͱݴΘΕ ΔͷͰίϥϜΛॻ͘ͷͰ͕͢ɺׂͱ޷͖উख͔ ָ͚͍ͯ͠Ͱ͢ ίϥϜͷதͰ͍͔͓ͭ͘ؾʹೖΓΛ঺հ͠·͢