...意外に便利だった!!

2019/10/30 PHP勉強会@東京で話したスライドです。

Transcript

1. ҙ֎ʹศརͩͬͨ
   2019/10/30 PHPษڧձ@౦ژ
   લా ࿨ਓ
   

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2. ࣗݾ঺հ
   w લా࿨ਓ
   w !DIJSPSVYYYY
   w 3PYY
   

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3. w εϙϯαʔืूதͰ͢ʂʂ
   

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4. ҙ֎ʹศརͩͬͨ
   

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5. ʮʯҙ֎ʹศརͩͬͨ
   

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6. 1)1ʹ͓͚Δʮʯ
   ͭ͋Δ
   

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7. ՄมݸҾ਺ؔ਺
   function printArgs(...$inputs)
   {
   echo $inputs[0]; // apple
   echo $inputs[1]; // banana
   echo $inputs[2]; // chocolate
   }
   printArgs('apple', 'banana', 'chocolate');
   

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8. Ҿ਺ͷΞϯύοΫ
   function printArgs($a, $b, $c)
   {
   // (ུ)
   }
   $args = ['apple', 'banana', 'chocolate'];
   printArgs(...$args);
   

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9. ஌ͬͯ͸͍͕ͨʜ
   w ػೳ͕ଘࡏ͢Δ͜ͱ͸஌ͬͯͨ
   w Ͱ΋࣮ࡍ͸શવ࢖ͬͯͳ͔ͬͨ
   w ΠϚΠν࢖͍Ͳ͜Ζ͕Θ͔Βͳ͔ͬͨ
   ‎ ࠷ۙɺศརͳ࢖͍ํΛݟ͚ͭͨ
   

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10. ྫ୊
    w ࣗ෼Ͱఆٛͨ͠4UBUVTΫϥε͕͋Δ
    w 4UBUVTΛෳ਺ѻ͏Ϋϥε͕΄͍͠
    w ഑ྻΛϥοϓͨ͠Ϋϥε
    w ཁ݅͸ҎԼ
    w ೚ҙͷ਺ͷ4UBUVTΠϯελϯεΛཁૉʹ࣋ͭ
    w 4UBUVTΠϯελϯεҎ֎Λཁૉʹ࣋ͬͯ͸͍͚ͳ͍
    w Ωʔ͸࿈൪ͷΈʹ͢Δ ࿈૝഑ྻʹ͠ͳ͍
    
    

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11. ·ͣ͸ී௨ʹ࣮૷͠·͢
    

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12. ී௨ͷ࣮૷
    class StatusCollection
    {
    private $items;
    public function __construct(array $items)
    {
    $this->items = $items;
    }
    }
    $items = [Status::random(), Status::random(), Status::random()];
    new StatusCollection($items);
    

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13. ී௨ͷ࣮૷
    class StatusCollection
    {
    private $items;
    public function __construct(array $items)
    {
    foreach ($items as $item) {
    if (!$item instanceof Status) {
    throw new InvalidArgumentException();
    }
    }
    $this->items = $items;
    }
    }
    $items = [Status::random(), Status::random(), Status::random()];
    new StatusCollection($items);
    

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14. ී௨ͷ࣮૷
    class StatusCollection
    {
    private $items;
    public function __construct(array $items)
    {
    foreach ($items as $item) {
    if (!$item instanceof Status) {
    throw new InvalidArgumentException();
    }
    }
    $this->items = array_values($items);
    }
    }
    $items = [Status::random(), Status::random(), Status::random()];
    new StatusCollection($items);
    

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15. Λ࢖͍͖ͬͯ·͢ʂ
    

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16. Λ࢖࣮ͬͨ૷
    class StatusCollection
    {
    private $items;
    public function __construct(...$items)
    {
    foreach ($items as $item) {
    if (!$item instanceof Status) {
    throw new InvalidArgumentException();
    }
    }
    $this->items = $items;
    }
    }
    $items = [Status::random(), Status::random(), Status::random()];
    new StatusCollection(...$items);
    

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17. Λ࢖࣮ͬͨ૷
    class StatusCollection
    {
    private $items;
    public function __construct(Status ...$items)
    {
    $this->items = $items;
    }
    }
    $items = [Status::random(), Status::random(), Status::random()];
    new StatusCollection(...$items);
    

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18. ศརʂʂ
    

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19. ·ͱΊ
    w ʮʯΛ࢖͏ͱҎԼͷέʔεͰϥΫʹͳΔ
    w ഑ྻͷΩʔʹ͍ͭͯߟ͑ͨ͘ͳ͍ͱ͖
    w ഑ྻͷཁૉͷܕΛറΓ͍ͨͱ͖
    

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