PHPで FizzBuzz問題をやってみよう #ゆるWeb札幌

by Kihara, Takuya

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PHPͰ  FizzBuzz໰୊Λ  ΍ͬͯΈΑ͏ 2019/03/30 tacck ゆるWeb勉強会@札幌 #4 #ゆるWeb札幌

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୭ UBDDL ໊લ ࠷ۙ͸ݹͷ+BWBͷ͓कΓ ͓࢓ࣄ εϓϨουɾΠʔάϧ ޷͖ͳϑΟΪϡΞεέʔτͷٕ ΏΔ8FCࡳຈ

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ࠓ೔͓࿩͢͠Δ͜ͱ • FizzBuzz໰୊ • ΍ͬͯΈΑ͏ • റΓϓϨΠ ΏΔ8FCࡳຈ

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FizzBuzz໰୊ ΏΔ8FCࡳຈ

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FizzBuzz໰୊ • ϓϩάϥϚʔͷᅂΈ ΏΔ8FCࡳຈ

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FizzBuzz໰୊ • 3ͷഒ਺Ͱ “Fizz” ͱग़ྗ • 5ͷഒ਺Ͱ “Buzz” ͱग़ྗ • 3ͷഒ਺ ͔ͭ 5ͷഒ਺Ͱ “FizzBuzz” ͱग़ྗ  (ͭ·Γ15ͷഒ਺) • ͦΕҎ֎͸਺஋ࣗମΛจࣈͱͯ͠ग़ྗ ΏΔ8FCࡳຈ

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FizzBuzz໰୊ • ࠓճ͸ɺ • 1ʙ100·Ͱͷ੔਺஋Λ༩͑Δɻ • લͷϖʔδͷنଇʹैͬͯग़ྗ͢Δɻ • ͱ͍͏ϓϩάϥϜΛ࡞੒͍ͯ͘͠ɻ ΏΔ8FCࡳຈ

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΍ͬͯΈΑ͏ ΏΔ8FCࡳຈ

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Step1: ૉ௚ͳ࣮૷ ΏΔ8FCࡳຈ

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ૉ௚ͳ࣮૷ • ࡉ͔͍͜ͱ͸ؾʹͤͣʹɻ https://github.com/tacck/PHPFizzBuzzTraining/tree/Step1 ΏΔ8FCࡳຈ

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Step2: ॳ৺ऀ޲͚ ΏΔ8FCࡳຈ

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ॳ৺ऀ޲͚ • FizzBuzzͷ൑ఆΛؔ਺(ϝιου)Խɻ https://github.com/tacck/PHPFizzBuzzTraining/tree/Step2 ΏΔ8FCࡳຈ

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Step3: ॳ৺ऀΑΓ্Λ໨ࢦ͢ ΫϥεΛ࢖͏ ΏΔ8FCࡳຈ

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ΫϥεΛ࢖͏ • ໾ׂͷ෼୲ΛΫϥεͰදݱ͢Δɻ • 1ʙ100ͷ਺஋ʹରԠ͢ΔจࣈྻΛදࣔ • ਺஋ͱจࣈͷରԠؔ܎Λ൑ఆ͠ฦ٫ https://github.com/tacck/PHPFizzBuzzTraining/tree/Step3 ΏΔ8FCࡳຈ

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getFizzBuzz($num) . PHP_EOL; }

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Step4: தڃऀ޲͚ Ϋϥεͷ੹೚Λ෼͚Δ ΏΔ8FCࡳຈ

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Ϋϥεͷ੹೚? • ͦͷΫϥε͕ʮҰͭͷ੹೚ʯʹด͍ͯ͡Δ͔ • ؔ৺ͷ෼཭ɺૄ݁߹ɺͱ͍ͬͨΩʔϫʔυɻ • 1ʙ100ͷ਺஋ʹରԠ͢ΔจࣈྻΛදࣔ • ਺஋ͱจࣈͷରԠؔ܎ͷ൑ఆ • ରԠ͢Δจࣈྻͷฦ٫ https://github.com/tacck/PHPFizzBuzzTraining/tree/Step4 ΏΔ8FCࡳຈ

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ؔ৺ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ • จࣈྻΛ֬ఆ͍ͤͨ͞ɻ ΏΔ8FCࡳຈ

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ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ  ˠ ϝιουͷݺͼग़͠ͱ݁Ռͷग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ  ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ  ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ

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ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ  ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ  ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ  ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ݺͼग़ͯ͠࢖͏ ݺͼग़ͯ͠࢖͏ ΏΔ8FCࡳຈ

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ؔ৺ͱ੹೚ ΏΔ8FCࡳຈ ΠϯλϑΣʔε ೖग़ྗ ͷ੹೚ ਖ਼͍͠σʔλΛड͚౉͢੹೚ ਖ਼͍͠σʔλͰ͋Δ੹೚ ґଘؔ܎͸  Ұํ޲ ґଘؔ܎͸  Ұํ޲

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num = $num; } public function __toString(): string { return 'Fizz'; } public function isAvailable(): bool { return true; } }

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Step5: റΓϓϨΠ ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ ΏΔ8FCࡳຈ

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ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ • ಄ͷମૢ ΏΔ8FCࡳຈ

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ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ • ಄ͷମૢ • ݱ࣮໰୊ͱͯ͠ɺ  ଟ਺ͷ৚݅෼ذ͸όάΛੜΈ΍͍͢ɻ  ˠ ʮଟ਺ʯͷ෦෼Λղ͖΄͙͢ https://github.com/tacck/PHPFizzBuzzTraining/tree/Step5 ΏΔ8FCࡳຈ

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ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ  ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ  ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ  ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ ͜͜ʹ৚݅෼ذ

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ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ  ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ  ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ  ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ ͜͜ʹ஫໨

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ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ  ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ  ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ  ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ ࢖͑Δ͔Ͳ͏͔͸ ʮදࣔ಺༰ʯࣗ਎͕஌Δ΂͖

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ؔ৺ͱ੹೚ ΏΔ8FCࡳຈ ΠϯλϑΣʔε ೖग़ྗ ͷ੹೚ ਖ਼͍͠σʔλΛड͚౉͢੹೚ ਖ਼͍͠σʔλͰ͋Δ੹೚

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isAvailable(); return $presenter; } catch (\ParseError $e) { // none } } return new \App\FizzBuzz\Presenter\NumberPresenter($num); } }

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num = $num; } public function __toString(): string { return 'Fizz'; } public function isAvailable(): bool { return ($this->num % 3 === 0 && $this->num % 5 !== 0) ? true : eval('invalid'); } }

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ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ • Ԡ༻ྫ • ݩ߸໰୊ • ৽ݩ߸͕ൃද͞ΕͨΒɺ  PresenterΫϥεΛ௥Ճ͢Δ͚ͩɻ https://github.com/tacck/PHPJapaneseEraTraining ΏΔ8FCࡳຈ

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·ͱΊ ΏΔ8FCࡳຈ

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·ͱΊ • FizzBuzz໰୊Λɺ  ͍͔ͭ͘ͷܗͰղ͍ͯΈͨɻ • ΦϒδΣΫτࢦ޲ͷߟ͑ํΛ͏·͘࢖͏ͱɺ  ҆શ͔֦ͭுੑΛߴ͘Ͱ͖Δɻ  ˠ ࠓճ࢖ͬͨͷ͸  ɹ ʮΦʔϓϯɾΫϩʔζυͷݪଇʯ • ಄ͷମૢΛ݉ͶͯɺറΓϓϨΠΛͯ͠ΈΑ͏! ΏΔ8FCࡳຈ

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·ͱΊ • ੹೚ͷ෼͚ํɺؔ৺ͷ෼཭ɺ  ࠷ॳ͸೉͍͠ɻ • ʮ͜ͷਓ(Ϋϥε)͸ԿΛ஌͍ͬͯΔ΂͖͔ʯ  ʮ͜ͷਓ(Ϋϥε)ʹ͸ԿΛ஻ͬͯཉ͍͔͠ʯ  ਓ(Ϋϥε)ͷؾ࣋ͪʹͳͬͯߟ͑Δɻ • TDD (ςετۦಈ։ൃ) Λ΍Δͱɺ  ʮΫϥεʹ໰͍͔͚ͳ͕Βʯ։ൃͰ͖Δɻ ΏΔ8FCࡳຈ