PHPで FizzBuzz問題をやってみよう #ゆるWeb札幌

PHPでFizzBuzz問題を解いていく。
シンプルな解き方から、段階的にオブジェクト指向を取り入れてみる。
ゆるWeb勉強会@札幌 #4
#ゆるWeb札幌

Transcript

1. 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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2. ୭
   UBDDL
   ໊લ
   ࠷ۙ͸ݹͷ+BWBͷ͓कΓ
   ͓࢓ࣄ
   εϓϨουɾΠʔάϧ
   ޷͖ͳϑΟΪϡΞεέʔτͷٕ
   ΏΔ8FCࡳຈ
   

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

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4. FizzBuzz໰୊
   
   ΏΔ8FCࡳຈ
   

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5. FizzBuzz໰୊
   • ϓϩάϥϚʔͷᅂΈ
   ΏΔ8FCࡳຈ
   

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

   (ͭ·Γ15ͷഒ਺)
   • ͦΕҎ֎͸਺஋ࣗମΛจࣈͱͯ͠ग़ྗ
   ΏΔ8FCࡳຈ
   

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

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8. ΍ͬͯΈΑ͏
   ΏΔ8FCࡳຈ
   

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9. Step1:
   ૉ௚ͳ࣮૷
   ΏΔ8FCࡳຈ
   

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

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11. 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;
    }
    }
    

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12. Step2:
    ॳ৺ऀ޲͚
    ΏΔ8FCࡳຈ
    

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

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14. 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";
    }
    }
    

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15. Step3:
    ॳ৺ऀΑΓ্Λ໨ࢦ͢
    ΫϥεΛ࢖͏
    ΏΔ8FCࡳຈ
    

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

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17. 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;
    }
    

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18. 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";
    }
    }
    }
    

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19. Step4:
    தڃऀ޲͚
    Ϋϥεͷ੹೚Λ෼͚Δ
    ΏΔ8FCࡳຈ
    

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

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

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22. ؔ৺ͱ੹೚
    • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ

    ˠ ϝιουͷݺͼग़͠ͱ݁Ռͷग़ྗ
    • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ

    ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫
    • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ

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

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23. ؔ৺ͱ੹೚
    • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ

    ˠ ϝιουͷݺͼग़͠ͱग़ྗ
    • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ

    ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫
    • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ

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

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

    Ұํ޲
    ґଘؔ܎͸

    Ұํ޲
    

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25. require_once __DIR__ . '/vendor/autoload.php';
    use App\FizzBuzz\FizzBuzzPresenterBuilder;
    for ($num = 1; $num <= 100; $num++) {
    echo FizzBuzzPresenterBuilder::build($num) . PHP_EOL;
    }
    

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26. 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);
    }
    }
    }
    

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27. 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;
    }
    }
    

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28. Step5:
    റΓϓϨΠ
    ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ
    ΏΔ8FCࡳຈ
    

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29. ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ
    • ಄ͷମૢ
    ΏΔ8FCࡳຈ
    

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30. 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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31. ؔ৺ͱ੹೚
    • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ

    ˠ ϝιουͷݺͼग़͠ͱग़ྗ
    • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ

    ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫
    • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ

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

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32. ؔ৺ͱ੹೚
    • ಛఆͷ੔਺஋Λ༩͑ɺจࣈྻΛग़ྗ͍ͨ͠ɻ

    ˠ ϝιουͷݺͼग़͠ͱग़ྗ
    • ੔਺஋ͱจࣈྻͷରԠΛอূ͍ͨ͠ɻ

    ˠ ੔਺஋Λड͚औΓɺରԠ͢Δදࣔ಺༰ͷฦ٫
    • දࣔ಺༰Λ֬ఆ͍ͤͨ͞ɻ

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

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

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35. require_once __DIR__ . '/vendor/autoload.php';
    use App\FizzBuzz\FizzBuzzPresenterBuilder;
    for ($num = 1; $num <= 100; $num++) {
    echo FizzBuzzPresenterBuilder::build($num) . PHP_EOL;
    }
    

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36. 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);
    }
    }
    

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37. 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');
    }
    }
    

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38. ifจΛ࢖Θͳ͍Ͱ࣮૷͢Δ
    • Ԡ༻ྫ
    • ݩ߸໰୊
    • ৽ݩ߸͕ൃද͞ΕͨΒɺ

    PresenterΫϥεΛ௥Ճ͢Δ͚ͩɻ
    https://github.com/tacck/PHPJapaneseEraTraining
    ΏΔ8FCࡳຈ
    

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39. ·ͱΊ
    ΏΔ8FCࡳຈ
    

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40. ·ͱΊ
    • FizzBuzz໰୊Λɺ

    ͍͔ͭ͘ͷܗͰղ͍ͯΈͨɻ
    • ΦϒδΣΫτࢦ޲ͷߟ͑ํΛ͏·͘࢖͏ͱɺ

    ҆શ͔֦ͭுੑΛߴ͘Ͱ͖Δɻ

    ˠ ࠓճ࢖ͬͨͷ͸

    ɹ ʮΦʔϓϯɾΫϩʔζυͷݪଇʯ
    • ಄ͷମૢΛ݉ͶͯɺറΓϓϨΠΛͯ͠ΈΑ͏!
    ΏΔ8FCࡳຈ
    

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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
    

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42. ࣍ճ༧ࠂ?
    • (PHPͰ)TDDΛ΍ͬͯΈΔ?
    ΏΔ8FCࡳຈ
    

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43. end
    ΏΔ8FCࡳຈ
    

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