What is the output of the following? “`js class Animal { constructor(name) { this.name = name; } speak() { return `${this.name} makes a noise.`; } } class Dog extends Animal { speak() { return `${this.name} barks.`; } } const d = new Dog(‘Rex’); console.log(d.speak()); console.log(d instanceof Animal); “`

Question

JavaScript Developer — Hard

What is the output of the following? “`js class Animal { constructor(name) { this.name = name; } speak() { return `${this.name} makes a noise.`; } } class Dog extends Animal { speak() { return `${this.name} barks.`; } } const d = new Dog(‘Rex’); console.log(d.speak()); console.log(d instanceof Animal); “`

Accepted Answer

The output will be 'Rex barks.' and the statement 'd instanceof Animal' will return true. This is because the `speak()` method in the Dog class overrides the method in the Animal class, and the `instanceof` operator checks if an object is an instance of a specific class.