PHPで
FizzBuzz問題をやってみよう #ゆるWeb札幌

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

2. ୭ UBDDL
   ໊લ ࠷ۙ͸ݹͷ+BWBͷ͓कΓ
   ͓࢓ࣄ εϓϨουɾΠʔάϧ
   ޷͖ͳϑΟΪϡΞεέʔτͷٕ ΏΔ8FCࡳຈ

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

4. FizzBuzz໰୊ ΏΔ8FCࡳຈ

5. FizzBuzz໰୊ • ϓϩάϥϚʔͷᅂΈ ΏΔ8FCࡳຈ

6. FizzBuzz໰୊ • 3ͷഒ਺Ͱ “Fizz” ͱग़ྗ • 5ͷഒ਺Ͱ “Buzz” ͱग़ྗ •

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

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

8. ΍ͬͯΈΑ͏ ΏΔ8FCࡳຈ

9. Step1: ૉ௚ͳ࣮૷ ΏΔ8FCࡳຈ

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

11. <?php for ($num = 1; $num <= 100; $num++) {

    if ($num % 3 === 0 && $num % 5 === 0) { echo 'FizzBuzz' . PHP_EOL; } elseif ($num % 3 === 0 && $num % 5 !== 0) { echo 'Fizz' . PHP_EOL; } elseif ($num % 3 !== 0 && $num % 5 === 0) { echo 'Buzz' . PHP_EOL; } else { echo "$num" . PHP_EOL; } }

12. Step2: ॳ৺ऀ޲͚ ΏΔ8FCࡳຈ

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

14. <?php for ($num = 1; $num <= 100; $num++) {

    echo getFizzBuzz($num) . PHP_EOL; } function getFizzBuzz(int $num): string { if ($num % 3 === 0 && $num % 5 === 0) { return 'FizzBuzz'; } elseif ($num % 3 === 0 && $num % 5 !== 0) { return 'Fizz'; } elseif ($num % 3 !== 0 && $num % 5 === 0) { return 'Buzz'; } else { return "$num"; } }

15. Step3: ॳ৺ऀΑΓ্Λ໨ࢦ͢ ΫϥεΛ࢖͏ ΏΔ8FCࡳຈ

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

17. <?php require_once __DIR__ . '/vendor/autoload.php'; use App\FizzBuzz\FizzBuzz; $fizzBuzz = new

    FizzBuzz(); for ($num = 1; $num <= 100; $num++) { echo $fizzBuzz->getFizzBuzz($num) . PHP_EOL; }

18. <?php namespace App\FizzBuzz; class FizzBuzz { public function getFizzBuzz(int $num):

    string { if ($num % 3 === 0 && $num % 5 === 0) { return 'FizzBuzz'; } elseif ($num % 3 === 0 && $num % 5 !== 0) { return 'Fizz'; } elseif ($num % 3 !== 0 && $num % 5 === 0) { return 'Buzz'; } else { return "$num"; } } }

19. Step4: தڃऀ޲͚ Ϋϥεͷ੹೚Λ෼͚Δ ΏΔ8FCࡳຈ

20. Ϋϥεͷ੹೚? • ͦͷΫϥε͕ʮҰͭͷ੹೚ʯʹด͍ͯ͡Δ͔ • ؔ৺ͷ෼཭ɺૄ݁߹ɺͱ͍ͬͨΩʔϫʔυɻ • 1ʙ100ͷ਺஋ʹରԠ͢ΔจࣈྻΛදࣔ • ਺஋ͱจࣈͷରԠؔ܎ͷ൑ఆ •

    ରԠ͢Δจࣈྻͷฦ٫ https://github.com/tacck/PHPFizzBuzzTraining/tree/Step4 ΏΔ8FCࡳຈ

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

22. ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ
 ˠ ϝιουͷݺͼग़͠ͱ݁Ռͷग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ
 ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ •

    දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ
 ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ

23. ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ
 ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ
 ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ •

    දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ
 ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ݺͼग़ͯ͠࢖͏ ݺͼग़ͯ͠࢖͏ ΏΔ8FCࡳຈ

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


    Ұํ޲

25. <?php require_once __DIR__ . '/vendor/autoload.php'; use App\FizzBuzz\FizzBuzzPresenterBuilder; for ($num =

    1; $num <= 100; $num++) { echo FizzBuzzPresenterBuilder::build($num) . PHP_EOL; }

26. <?php namespace App\FizzBuzz; use App\FizzBuzz\FizzBuzzPresenterInterface; class FizzBuzzPresenterBuilder { public static

    function build(int $num): FizzBuzzPresenterInterface { if ($num % 3 === 0 && $num % 5 === 0) { return new \App\FizzBuzz\Presenter\FizzBuzzPresenter($num); } elseif ($num % 3 === 0 && $num % 5 !== 0) { return new \App\FizzBuzz\Presenter\FizzPresenter($num); } elseif ($num % 3 !== 0 && $num % 5 === 0) { return new \App\FizzBuzz\Presenter\BuzzPresenter($num); } else { return new \App\FizzBuzz\Presenter\NumberPresenter($num); } } }

27. <?php namespace App\FizzBuzz\Presenter; use App\FizzBuzz\FizzBuzzPresenterInterface; class FizzPresenter implements FizzBuzzPresenterInterface {

    private $num; public function __construct(int $num) { $this->num = $num; } public function __toString(): string { return 'Fizz'; } public function isAvailable(): bool { return true; } }

28. Step5: റΓϓϨΠ ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ ΏΔ8FCࡳຈ

29. ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ • ಄ͷମૢ ΏΔ8FCࡳຈ

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

31. ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ
 ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ
 ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ •

    දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ
 ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ ͜͜ʹ৚݅෼ذ

32. ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ
 ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ
 ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ •

    දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ
 ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ ͜͜ʹ஫໨

33. ؔ৺ͱ੹೚ • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ
 ˠ ϝιουͷݺͼग़͠ͱग़ྗ • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ
 ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫ •

    දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ
 ˠ ࣗ਎͕ར༻͞ΕΔ৔߹ʹදࣔ಺༰Λฦ٫ ΏΔ8FCࡳຈ ࢖͑Δ͔Ͳ͏͔͸
    ʮදࣔ಺༰ʯࣗ਎͕஌Δ΂͖

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

35. <?php require_once __DIR__ . '/vendor/autoload.php'; use App\FizzBuzz\FizzBuzzPresenterBuilder; for ($num =

    1; $num <= 100; $num++) { echo FizzBuzzPresenterBuilder::build($num) . PHP_EOL; }

36. <?php namespace App\FizzBuzz; use App\FizzBuzz\FizzBuzzPresenterInterface; class FizzBuzzPresenterBuilder { public static

    function build(int $num): FizzBuzzPresenterInterface { foreach (glob(__DIR__ . '/Presenter/Dynamic/*.php') as $file) { require_once $file; $class = '\App\FizzBuzz\Presenter\Dynamic\\' . basename($file, '.php'); $presenter = new $class($num); try { // throw ParseError if $num is not available $presenter->isAvailable(); return $presenter; } catch (\ParseError $e) { // none } } return new \App\FizzBuzz\Presenter\NumberPresenter($num); } }

37. <?php namespace App\FizzBuzz\Presenter\Dynamic; use App\FizzBuzz\FizzBuzzPresenterInterface; class FizzPresenter implements FizzBuzzPresenterInterface {

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

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

39. ·ͱΊ ΏΔ8FCࡳຈ

40. ·ͱΊ • FizzBuzz໰୊Λɺ
 ͍͔ͭ͘ͷܗͰղ͍ͯΈͨɻ • ΦϒδΣΫτࢦ޲ͷߟ͑ํΛ͏·͘࢖͏ͱɺ
 ҆શ͔֦ͭுੑΛߴ͘Ͱ͖Δɻ
 ˠ ࠓճ࢖ͬͨͷ͸
 ɹ

    ʮΦʔϓϯɾΫϩʔζυͷݪଇʯ • ಄ͷମૢΛ݉ͶͯɺറΓϓϨΠΛͯ͠ΈΑ͏! ΏΔ8FCࡳຈ

41. ·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

42. ࣍ճ༧ࠂ? • (PHPͰ)TDDΛ΍ͬͯΈΔ? ΏΔ8FCࡳຈ

43. end ΏΔ8FCࡳຈ