JavaScriptBasics

JavaScript Operators

Learn JavaScript operators including arithmetic, assignment, comparison, logical, and unary operators, with clear examples and real-world use cases for beginners.

What are Operators in JavaScript?Link to this section

Operators are special symbols used to perform operations on values and variables. They allow JavaScript programs to calculate values, compare data, assign values, and make decisions. Without operators, JavaScript would not be able to perform logic, calculations, or conditional checks.

Types of JavaScript Operators Link to this section

JavaScript provides several types of operators, each designed for a specific purpose:
  • Arithmetic Operators
  • Assignment Operators
  • Comparison Operators
  • Logical Operators
  • Unary Operators

Arithmetic Operators :Link to this section

Arithmetic operators are used to perform mathematical calculations.

Common Arithmetic Operators

- `+` Addition - `-` Subtraction - `*` Multiplication - `/` Division - `%` Modulus (remainder)

note

The % operator is commonly used to check even or odd numbers.

Assignment Operators :Link to this section

Assignment operators are used to assign values to variables.

Common Assignment Operators

- `=` Assign - `+=` Add and assign - `-=` Subtract and assign - `*=` Multiply and assign

tip

Compound assignment operators make code shorter and easier to read.

Comparison OperatorsLink to this section

Comparison operators are used to compare two values and return a boolean result (true or false).

Common Comparison Operators

- `==` Equal (value only) - `===` Strict equal (value + type) - `!=` Not equal - `!==` Strict not equal - `>` Greater than - `<` Less than

warning

Always prefer === over == to avoid unexpected type conversion bugs.

Logical OperatorsLink to this section

Logical operators are used to combine multiple conditions.

Logical Operators

- `&&` AND - `||` OR - `!` NOT

tip

Logical operators are heavily used in conditions, authentication, and validation logic.

Unary OperatorsLink to this section

Unary operators operate on a single operand.

Common Unary Operators

- `++` Increment - `--` Decrement - `typeof` Type checking

note

Increment and decrement operators are often used in loops.

Operator PrecedenceLink to this section

Operator precedence determines which operation is performed first in an expression.
Example explanation: Multiplication and division are evaluated before addition and subtraction unless parentheses are used.

tip

Use parentheses () to make expressions clear and avoid confusion.
Check Your Understanding
Question 1 of 5

Which operator is used to check both value and type?

Arithmetic Practice

easy

Write a program to calculate the total price after adding tax to a product....

Comparison Check

easy

Compare a number with a string version of the same number using == and ===. Observe the difference....

Logical Conditions

medium

Write a condition that checks whether a user is logged in and has admin access....

Increment Usage

medium

Create a counter variable and increment it three times using the ++ operator....