Javascript

var grade = 95;

if (grade >= 90)
	console.log("A");
else if (grade >= 80)
	console.log("B");
else if (grade >= 70)
	console.log("C");
else
	console.log("Work harder ...");

Operators

&&, and

||, or

!, not

var a = 10;

if (a < 20 && a%2 == 0)
	console.log(true)

Conditional (Ternary) Operator

var age = 20;
var voteable = (age < 18) ? "Too young":"Old enough";

console.log(voteable);