Why do we make an object constructor using this keyword and don't we simple write return { a: x, b:y} in the function?

Question

So, when we make an object constructor we write:

function example(x,y){
this.name = x;
this.age = y;
}

var person = new example("John", 18);

I understand how this works, new keyword creates a new object, this keyword creates the properties, wouldn't it however be easier to simple write:

function example(x,y){
return {name: x, age: y};
}

var person = example("John", 18);

Answer 1

With return keyword, you store an object into person by calling the function.

With this keyword and new keyword, you store an instance of a class into person.

There is no difference up to this point.

But for class, you can define class method

Example.prototype.introduce = function(){
console.log(`Hi, I am ${this.name`} of ${this.age} year old.`);
}

That's called abstraction, or OOP.