1. What Are Operators? 🤔

An operator is a symbol that tells the program to perform an operation on values.

Example:

let result = 5 + 3;

Here:

5 and 3 → operands
+ → operator

The + operator adds the numbers together.

Output:

8

2. Arithmetic Operators ➕➖✖️➗

Arithmetic operators perform basic mathematical calculations.

Example in JavaScript

let a = 10;
let b = 3;

console.log(a + b);
console.log(a - b);
console.log(a * b);
console.log(a / b);
console.log(a % b);

Output:

13
7
30
3.333...
1

Explanation:

10 % 3 = 1

Because 3 goes into 10 three times with remainder 1.

3. Comparison Operators 🔍

Comparison operators compare two values and return true or false.

Example

console.log(5 == "5");
console.log(5 === "5");

Output:

true
false

Why?

5 == "5"  → only compares values
5 === "5" → compares value AND type

So:

5 == "5"  → true
5 === "5" → false

Because "5" is a string, not a number.

4. Logical Operators 🔗

Logical operators combine multiple conditions.

AND Operator (&&)

Returns true only if both conditions are true.

let age = 20;

console.log(age > 18 && age < 30);

Output:

true

Because both conditions are true.

OR Operator (||)

Returns true if at least one condition is true.

console.log(5 > 10 || 8 > 3);

Output:

true

Because 8 > 3 is true.

NOT Operator (!)

Reverses a boolean value.

console.log(!true);
console.log(!false);

Output:

false
true

Logical Operator Truth Table

5. Assignment Operators 📝

Assignment operators assign values to variables.

Example

let x = 10;

x += 5;
console.log(x);

Output:

15

Explanation:

x += 5
means
x = x + 5

Operator Categories Diagram

Assignment Practice 💻

Try these exercises.

1. Perform Arithmetic Operations

let a = 12;
let b = 4;

console.log(a + b);
console.log(a - b);
console.log(a * b);
console.log(a / b);

2. Compare Two Values

let x = 5;
let y = "5";

console.log(x == y);
console.log(x === y);

Observe the difference in output.

3. Use Logical Operators

let age = 22;

if (age > 18 && age < 60) {
  console.log("You are eligible to work");
}