TL;DR: Optional Arguments generate a hidden coupling in the name of smaller code.

문제

솔루션

샘플 코드

잘못된

<?

final class Poll {

    function _construct(array $questions, bool $annonymousAllowed = false, $validationPolicy = 'Normal') {

        if ($validationPolicy == 'Normal') {
          $validationPolicy = new NormalValidationPolicy();
        }
        //...
    }
}

//Valid
new Poll([]);
new Poll([], true);
new Poll([], true , new NormalValidationPolicy());
new Poll([], , new StrictValidationPolicy());

오른쪽

<? 

final class Poll {

    function _construct(array $questions, AnonnyomousStrategy $annonymousStrategy, ValidationPolicy $validationPolicy) {            
        //...
    }
}


//invalid
new Poll([]);
new Poll([], new NoAnonnyomousValidStrategy());
new Poll([], , new StrictValidationPolicy());

//Valid
new Poll([], new NoAnonnyomousValidStrategy(), new StrictValidationPolicy());

발각

태그

결론

더 많은 정보

The trouble with programmers is that you can never tell what a programmer is doing until it’s too late.