JavaScript Daily Challenge How? ANYONE?

Question

//How is the output is 1?

var a = null == undefined;
var b = null === undefined;
var c = a + b;
alert(c)

//null is nothing right?

Answer 1

null == undefined is true (1)
null === undefined is false (0)
So, 1 + 0 = 1 is alerted.

Answer 2

@krishna teja so you mean sir true = 1 and false = 0? is that it?

Answer 3

Thanks guys 🙌 it is clear now 😊 I was just confused where the 1 came from. But it now clear to me thanks to you guys 😊

Answer 4

@Ben Bright oh I see that's how it is. thank you 😊

Answer 5

As Sir Krishna already laid out just want to make it more clearer:

== // checks for same value of its operands
=== // checks for same type and value of its operands

in terms of ==
null and undefined have same value // nothing
so null == undefined // true

in terms of ===
typeof null // object
typeof undefined // undefined
so null === undefined // false

Hence, true + false => 1 + 0 => 1

Answer 6

@kapil whaval oh i see that's the thing that really confused me thank you. How about null? does it also return to 1 or 0?

Answer 7

@rookie I guess what you want to know is how some types are converted to boolean. Here is a little Boolean Conversion cheatsheet for you:

empty string '', null, undefined and NaN
- All the above converts to false

- Any other type apart from those above converts to true

Answer 8

https://www.sololearn.com/discuss/542577/?ref=app

Answer 9

Yes, if any condition is true then 1 is returned and if condition is false then 0 is returned ... for e.g if we write c = 5>2 .. here 5 is greater than 2 thus it will become c = 1 .. Hence, 1 will be assigned to c .

Answer 10

I'm new here and don't know anything about it can someone teach me what the code is? pls

Answer 11

х.

Answer 12

х.