Increment value from a object using object.assign and get the new value at the next get of the object

IncrementValue.js

function setup () {
  return {
    obj: { val: 1 },
    increment() { return Object.assign(this.obj, { val: this.obj.val + 1 })},
  }
}

const object = setup();


console.log(object.obj.val);
object.increment();
object.increment();
object.increment();
object.increment();
object.increment();
object.increment();
object.increment();
object.increment();
object.increment();
object.increment();
console.log(object.obj.val);