Methods

Question

Why is the output 1994?
function person(name, age) {
this.name= name;
this.age = age;
this.yearOfBirth = bornYear;
}
function bornYear() {
return 2016 - this.age;
}

var p = new person("A", 22);
document.write(p.yearOfBirth());
// Outputs 1994

Answer 1

Simple: 2016 - 22 = 1994.😂

Explanation: since p is a new person object, you just have to replace the 'this' with 'p'. So p.yearOfBirth() is a method that calls the bornYear function. And the bornYear function returns the value of 2016 - 22.

Answer 2

What do you expect? Someone who is 22 in 2016, was born around 1994.

Answer 3

Oops, so simple.... “-“ overlooked the operator

Answer 4

as we know this operator give the current location so in the person object we passed 22 and in the function definition born year we returned 2016- this.age where this.age will be substrated from 2016. the value of this.age is 22