not operator js

1// || means or

1let a = true;
2
3let b = !a;
4
5console.log(b); //output: false

1let a = 1;
2let b = -1;
3
4if (a > 0 & b > 0){
5	console.log("and");
6} else if (a > 0 || b > 0){
7	console.log("or");
8}