Answer 1

"... The JS spec is that any == comparison with a boolean first coerces the boolean to a number... "

"... to compare a string and a number, JS converts the string to a number... "

https://stackoverflow.com/questions/33705381/is-a-string-of-whitespace-truthy-or-falsy-in-javascript

Answer 2

Give these excellent articles a read.
https://www.sitepoint.com/javascript-truthy-falsy/
https://hackernoon.com/understanding-js-coercion-ff5684475bfc

Answer 3

" " is not an empty string, an empty string is ""
" " is a string contains spacing character.

" " is a string contains 3 spacing characters.

How could a string contains 3 characters return false as empty string?

Answer 4

https://code.sololearn.com/WSl7AR07WDDx/?ref=app

Answer 5

s.IndexOf(' ') > 0 means whitespaces are there ....🤔

Answer 6

First of all space is not mean empty ; you should be using "" instead of " " . But instead of using quotes you should be using

If (!varString){
console.log("It is null");
}

Using ! Infront of variable will check if it is null, ("") , undefined or false also for numbers if it is 0 or NaN.

Here is an example for you:
Https://code.sololearn.com/W5mqnu9RxVK2

Answer 7

Https://code.sololearn.com/
W5mqnu9RxVK2