how do i do operation check in javascript code example

Example 1: or operator in javascript

//The OR operator in Javascript is 2 verticals lines: ||

var a = true;
var b = false;

if(a || b) {
	//one of them is true, code inside this block will be executed
}

Example 2: modulus js

console.log(10%3);
//returns 1 (the remainder of 10/3)