What does the speak() method works here? and how to use it as I don't see it in the constructor method

Question

class Pet {
  constructor(animal, age, breed, sound) {
    this.animal = animal;
    this.age = age;
    this.breed = breed;
    this.sound = sound;
  }
  speak() {
    console.log(this.sound);
  }

Peter Vann · Accepted Answer

Hi Hanwen!
The method does NOT need to be part of the constructor because it does not require any initialized value.
It does, use the "sound" property value, however, which IS initialized in the constructor.
Consider this code:
```javascript
class Pet {
    constructor(animal, age, breed, sound) {
        this.animal = animal;
        this.age = age;
        this.breed = breed;
        this.sound = sound;
    }
speak() {
    console.log(this.sound);
}
}
const myPet = new Pet('dog', 4, 'pit bull', 'snarl');
myPet.speak();
```
It will log "snarl", to the console.
I hope that helps.
Stay safe and happy coding!

Kylie Soderblom · Answer

the constructor includes only properties! 
Methods are included inside the new class object but outside of the constructor function.
```
class NewClass {        // new class  blueprint for all future instances
   constructor (animal, age) {   // only properties
        this.animal = animal;
        this.age = age;
      }
speak()                       // new methods inside new class
anotherMethod()  
}
```
// note the word 'function' is not used when adding methods inside a class

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Hanwen Zhang

Hanwen Zhang

What does the speak() method works here? and how to use it as I don't see it in the constructor method

2 Answers

Peter Vann

Peter Vann

Hanwen Zhang

Hanwen Zhang

Kylie Soderblom

Kylie Soderblom