What Are Operators?

Operators perform actions on values and variables. For example, the + operator adds two numbers, and the === operator compares two values for equality and type.

Types of Operators

1. Arithmetic Operators

Used for mathematical operations:

• + (Addition) → 5 + 3 // 8
• - (Subtraction) → 10 - 4 // 6
• * (Multiplication) → 6 * 7 // 42
• / (Division) → 8 / 2 // 4
• % (Modulus) → 7 % 3 // 1
• ** (Exponentiation) → 2 ** 3 // 8

2. Assignment Operators

Assign values to variables:

• = (Simple assignment) → let x = 5;
• += (Add and assign) → x += 3; // same as x = x + 3
• -= (Subtract and assign) → x -= 2;

3. Comparison Operators

Compare values and return true or false:

• == Equal (loose comparison, type conversion allowed)
• === Strict equal (no type conversion)
• != Not equal
• !== Strict not equal
• > Greater than
• < Less than
• >= Greater than or equal
• <= Less than or equal

4. Logical Operators

Used for logical comparisons:

• && (AND) → true && false // false
• || (OR) → true || false // true
• ! (NOT) → !true // false

5. String Operators

• + Concatenates strings.
  Example: "Hello" + " World" → "Hello World"

Expressions in JavaScript

An expression is any valid set of literals, variables, operators, and functions that returns a value.
Example:
let result = (5 + 3) * 2; // 16

‍