learn2kode.in

Menu

JavaScript Tutorial

Menu

JavaScript Operators

JavaScript operators are symbols that allow you to perform actions on values and variables.
You use operators to calculate numbers, compare values, assign data, and more.

Example
Copy Text 
let x = 10 + 5;

Here + is an operator.

Types of JavaScript Operators

JavaScript has several types of operators:

  • Arithmetic Operators
  • Assignment Operators
  • Comparison Operators
  • Logical Operators
  • String Operators
  • Unary Operators
  • Ternary Operator

Let’s learn each one with examples.

1. Arithmetic Operators

Used to perform mathematical calculations.

Operator Description Example (x = 10, y = 5) Result
+ Addition x + y 15
- Subtraction x - y 5
* Multiplication x * y 50
/ Division x / y 2
% Modulus (remainder) x % y 0
** Exponentiation x ** 2 100
++ Increment x++ 10 → 11
-- Decrement x-- 10 → 9
Example
Copy Text 
let a = 7;
let b = 3;
console.log(a % b); // 1
2. Assignment Operators

Used to assign values to variables.

Operator Meaning Example Equivalent to
= Assign x = 5 —
+= Add & assign x += 3 x = x + 3
-= Subtract & assign x -= 2 x = x - 2
*= Multiply & assign x *= 4 x = x * 4
/= Divide & assign x /= 5 x = x / 5
%= Modulus & assign x %= 2 x = x % 2
Example
Copy Text 
let x = 10;
x += 5;
console.log(x); // 15
3. Comparison Operators

Used to compare values. They return true or false.

Operator Description Example Result
== Equal (value only) 5 == "5" true
=== Strict equal (value + type) 5 === "5" false
!= Not equal 5 != 3 true
!== Strict not equal 5 !== "5" true
> Greater than 10 > 5 true
< Less than 3 < 1 false
>= Greater or equal 10 >= 10 true
<= Less or equal 5 <= 4 false
Important:

👉 Always prefer === instead of == to avoid unexpected type conversion.

4. Logical Operators

Used to combine multiple conditions.

Operator Name Example Result
&& AND age >= 18 && hasID true (both conditions are true)
|| OR age >= 18 || hasID true (at least one condition is true)
! NOT !hasID false (opposite of true)
Example
Copy Text 
let age = 20;
let hasID = true;

if (age >= 18 && hasID) {
  console.log("Access granted");
}
5. String Operators

Only one main operator: + (plus) for string concatenation.

Example
Copy Text 
let first = "Learn2";
let second = "Kode";
console.log(first + second); // Learn2Kode
+= also works:
Copy Text 
let text = "Hello";
text += " World";
console.log(text); // Hello World
6. Unary Operators

Operators that work with one operand.

Operator Use Example
typeof Check data type typeof 10 → "number"
! NOT !true → false
+ Convert to number +"10" → 10
- Negative -5 → -5
7. Ternary Operator (?:)

Shortcut for if...else.

Syntax
Copy Text 
condition ? valueIfTrue : valueIfFalse
Example
Copy Text 
let age = 18;
let message = (age >= 18) ? "Adult" : "Minor";
console.log(message);

Final Summary

Type Purpose
Arithmetic Math calculations
Assignment Update/assign values
Comparison Compare values
Logical Combine conditions
String Combine text
Unary Work with one value
Ternary Short if-else
JavaScript Data Types
JavaScript Comments