Nullish coalescing

Question

What is the output of below code :
let firstName;
let lastName;
let nickName = ‘Wolverine’;
console.log(firstName ?? lastName ?? nickName ?? ‘Arshad khan’);

Answer 1

not the same result if the condition returns an empty string '' or 0. It returns the left-hand side instead.

const foo = '' ?? 'default string';
console.log(foo);
// output: ''
const boo = '' || 'default string';
console.log(boo)
// output: 'default string'
const baz = 0 ?? 42;
console.log(baz);
// output: 0
const bar = 0 || 42
console.log(bar)
// output: 42

https://code.sololearn.com/cmGho9jKf8r0/?ref=app

Answer 2

Solomoni Railoa But we can achieve the same using || operator.

Answer 3

Solomoni Railoa correct

Answer 4

Bob_Li goog explanation.