Javascript doubt in challenge questions.

Question

https://code.sololearn.com/WvXXs7YBLTxB/?ref=app

Answer 1

gokul b

Or operator returns only first true value

true || false = true
false || true = true

In this example a is undefined and b is null and both a and b are not value.

c and d has value and both are true so first true value will be return

So 4 || 'five' = 4

if you write d || c then 'five' will be return.

Answer 2

gokul b

let is blocked scope variable means if you define let in if condition then you cannot access outside if block

if (true) {
let a = 'abc';
}

console.log(a) //error

if (true) {
var a = 'abc';
}

console.log(a) //print abc

https://www.sololearn.com/post/1280529/?ref=app

Answer 3

A͢J - S͟o͟l͟o͟H͟e͟l͟p͟e͟r͟ thanks.
And please define let.