How to make a NOT includes in js

Question

I mean its just an includes in js but reverse the true will be false and the false will be true

https://code.sololearn.com/W69veGAmYT1N/?ref=app

Answer 1

if (!words.includes("word") {
//Not exist "word" in words
}

Answer 2

! true = > false
! false = > true

! => not opearator

Answer 3

Let's say you checked it as follows ...

var exists = haystack.includes( needle );

<exists> will be true when <haystack> has <needle> as one of its substring.

If you want to inverse <exists> in JS log, you can simply use the unary logical NOT operator as follows,

console.log ( !exists );

Answer 4

something like this?

var someString = "just a random string";
var value = someString.includes("random") ? false : true;
console.log(value);

stored the inverse of includes() in another variable value OR just directly use the ternary operator where you wish to reverse the value