Template Method

The template method is a class behavioural pattern.

Example

abstract class BaseClass {
  public templateMethod(): void {
    this.actionA();
    this.actionB();
  }

  public actionA(): void {
    throw new Error('should not be invoker by BaseClass');
  }

  public actionB(): void {
    throw new Error('should not be invoker by BaseClass');
  }
}

class ConcreteAClass extends BaseClass {
  actionA(): void {
    console.log('A take actionA');
  }

  actionB(): void {
    console.log('A take actionB');
  }
}

class ConcreteBClass extends BaseClass {
  actionA(): void {
    console.log('B take actionA');
  }

  actionB(): void {
    console.log('B take actionB');
  }
}

(function main() {
  const a = new ConcreteAClass();
  const b = new ConcreteBClass();

  a.templateMethod();
  b.templateMethod();
})();
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