if not in javascript code example

Example 1: not operator js

let a = true;

let b = !a;

console.log(b); //output: false

Example 2: javascript if not

var isDay = false;
if (!isDay) { //Will execute if isDay is false
  console.log("It's night");
}

Example 3: javascript if or

let A = 1;
let B = 0;
if (A == 1 || B == 1){
  	// some code here
}

Example 4: and javascript

let a = 1;
let b = -1;

if (a > 0 & b > 0){
	console.log("and");
} else if (a > 0 || b > 0){
	console.log("or");
}