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Interface Segregation Principle

介面隔離原則

分離的操作

有問題的架構

Example​

  • Bad way:
interface Bird {
  fly(): void;
  walk(): void;
}

class Nightingale implements Bird {
  public fly() {
    /// ...
  }
  public walk() {
    /// ...
  }
}

Kiwi 奇異鳥不會飛！！！

  • Good way:
class Kiwi implements Bird {
  public fly() {
    throw new Error("Unfortunately, Kiwi can not fly!");
  }
  public walk() {
    /// ...
  }
}
interface CanWalk {
  walk(): void;
}

interface CanFly {
  fly(): void;
}

class Nightingale implements CanFly, CanWalk {
  public fly() {
    /// ...
  }
  public walk() {
    /// ...
  }
}

class Kiwi implements CanWalk {
  public walk() {
    /// ...
  }
}