Advance JS Quiz Series (Part-1)

1. What's the output?

let c = { greeting: 'Hey!' };
let d;

d = c;
c.greeting = 'Hello';
console.log(d.greeting);

• A: Hello
• B: Hey!
• C: undefined
• D: ReferenceError
• E: TypeError

Comment your Answer Below

Comments

[hermann-p]

As c is no primitive, d = c sets the value of d to the same reference pointer that references c.
That means c.greeting = ... means "lookup the object referenced by c and mutate its value".
As c and d are only references to the same object, the Output is, of course, 'Hello'.
Everyone confused by this behavior should start looking into the basics of a functional programming style ;)

[Bùi Hồng Quân]

A: Hello

[Akshay Mandliya]

correct

[NiewView]

A. Hello

[Akshay Mandliya]

correct answer

[Remi Vledder]

So this would be a example of "Pass by reference"?