MENU


Generator and async Methods

Generators and async functions may be defined as the methods of a class.


RESETRUNFULL
<!DOCTYPE html><html><body><script>

//(continues from the example in 8.6.2)class GermanShepherd extends Dog{  // default contructor
   *bark(){   // generator
      while (true){
          console.log('whoaaaf');
          yield;
          console.log('whoaaaf whoaaf');
          yield;
          console.log('whoaaaf whoaaf whoaf');
          yield;
      }
   }
   async sleep(){  // async function
      await new Promise(resolve=>{
                       console.log(this.name+' has fallen asleep.');
                       resolve();
      }).then(()=>
             console.log(this.name+' seems to have awaken.'));
      console.log('When will '+this.name+' sleep again?');
   }}var s = new GermanShepherd('Smartie',3,'Black');var sb = s.bark();sb.next(); // whoaaafsb.next(); // whoaaaf whoaafs.sleep(); // Smartie has fallen asleep.sb.next(); // whoaaaf whoaaf whoafsb.next(); // whoaaaf// Smartie seems to have awaken.// When will Smartie sleep again?

</script></body><html>

In any case, you can omit super() in your subclass, if you omit the constructor altogether in your subclass. A 'hidden' default constructor will be included automatically in your subclass. However, if you do include the constructor in your subclass, super() mustmust must be called in that constructor.For a base class, the default constructor is simple:

constructor(){}

For a derived class, the default constructor is:


RESETRUNFULL
<!DOCTYPE html><html><body><script>

constructor(...args) {
  super(...args);}

</script></body><html>