JavaScript Operators: The Basics You Need to Know

Operators are symbols that tells computer to take action:

Arithmetic operators

let a = 10;
let b = 3;

console.log(a + b); // 13
console.log(a - b); // 7
console.log(a * b); // 30
console.log(a / b); // 3.333...
console.log(a % b); // 1 //gives remainder after division

Comparison Operators

 == : Equal (loose) eg. 5 =="5" will return true
 ===: strict equal eg. 5=="5" will return false
 !=: not equal eg. 5!=3 will return true
 >: greater than 5>3 will return true
 < :less than 5<3 will return true

Logical Operators

&& : AND
|| : OR
! : Not

Truth Table( &&):

• True && True = True
• True && False = False
• False && True = False
• false && false = false

Truth table(||):

• True || true = true
• true || false = true
• false || true = true
• false || false = false

Truth Table : (!)

• true =false
• false = true

example

let age = 20;
let hasID = true;

console.log(age > 18 && hasID); // true
console.log(age < 18 || hasID); // true
console.log(!hasID); // false