JavaScript Operators: A Complete Tutorial

4/13/2025

#JavaScript Operars: A Complete Tutorial

Go Back

JavaScript Operators: A Complete Tutorial

Operators in JavaScript are symbols used to perform operations on values and variables. They are fundamental to building expressions and implementing logic in your code. In this tutorial, we’ll cover the various types of JavaScript operators with examples.

#JavaScript Operars: A Complete Tutorial

1. Arithmetic Operators

These are used to perform basic mathematical operations:

Operator Description Example Result
+ Addition 5 + 3 8
- Subtraction 5 - 3 2
* Multiplication 5 * 3 15
/ Division 6 / 2 3
% Modulus (Remainder) 5 % 2 1
** Exponentiation 2 ** 3 8
++ Increment a++ a = a + 1
-- Decrement a-- a = a - 1

2. Assignment Operators

These are used to assign values to variables.

Operator Example Equivalent To
= x = 10 Assign 10 to x
+= x += 5 x = x + 5
-= x -= 3 x = x - 3
*= x *= 2 x = x * 2
/= x /= 4 x = x / 4
%= x %= 2 x = x % 2
**= x **= 2 x = x ** 2

3. Comparison Operators

These compare two values and return a Boolean (true or false).

Operator Description Example Result
== Equal to (loose) 5 == '5' true
=== Equal to (strict) 5 === '5' false
!= Not equal (loose) 5 != '5' false
!== Not equal (strict) 5 !== '5' true
> Greater than 5 > 3 true
< Less than 5 < 3 false
>= Greater than or equal 5 >= 5 true
<= Less than or equal 5 <= 4 false

4. Logical Operators

Used to combine conditional statements.

Operator Description Example Result
&& Logical AND true && false false
`   ` Logical OR
! Logical NOT !true false

5. String Operators

JavaScript uses the + operator to concatenate strings.

let greeting = "Hello" + " " + "World"; // "Hello World"

You can also use += to append strings:

let name = "John";
name += " Doe"; // "John Doe"

6. Type Operators

typeof

Returns the type of a variable.

typeof "hello"; // "string"
typeof 42;      // "number"

instanceof

Checks if an object is an instance of a specific class.

let date = new Date();
console.log(date instanceof Date); // true

7. Bitwise Operators

These perform operations on binary representations of numbers.

Operator Name Example
& AND 5 & 1
` ` OR
^ XOR 5 ^ 1
~ NOT ~5
<< Left shift 5 << 1
>> Right shift 5 >> 1

Final Thoughts

JavaScript operators are powerful tools for building logic, manipulating data, and controlling program flow. Mastering them is crucial for any developer looking to write clean and efficient JavaScript code.

Practice combining these operators in real examples and you'll quickly become comfortable using them in your projects!

Table of content