3. What will be the console.log statements print
const obj = {
name: 'Billy',
sing: function () {
this.age = "20"
console.log('a' , this);
var anotherFunction = function() {
this.age = "30"
console.log('b', this);
}
anotherFunction();
}
}
obj.sing(); //first console will print properties of obj(name, age and sing) and second will print window object

Question

3. What will be the console.log statements print
const obj = {
  name: 'Billy',
  sing: function () {
      this.age = "20"
    console.log('a' , this);
    var anotherFunction = function() {
        this.age = "30"
       console.log('b', this);
    }
    anotherFunction();
}
  }
obj.sing();         //first console will print properties of obj(name, age and sing) and second will print window object

Sigiloso · Accepted Answer

Ans 3. 
First console will print properties of obj(name, age and sing) since the this inside sing belongs to const obj and second will print window object becase function belongs to window so this inside that will print window object.
a {name: "Billy", age: "20", sing: ƒ}
b Window {parent: Window, opener: null, top: Window, length: 4, frames: Window, …}

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