Lesson 3 of 20
Operators
Calculate, compare and combine values.
Introduction
JavaScript uses arithmetic operators such as +, -, *, / and %. Comparison operators produce booleans.
Use === for strict equality and logical operators such as && and || to combine conditions.
Key insight
Calculate, compare and combine values.
Example
const price = 12;
const quantity = 3;
console.log(price * quantity >= 30);This example shows the core operators idea in a small, runnable program.
Real-world example
Checkout totals and validation rules depend on operators.
Test yourself
2-question check
1
What is the main idea in Operators?
2
Where can operators be useful?
Ready to check your understanding?
Answer every question, then submit your quiz.
Try it yourself
JavaScript compiler
Runs in your browser. Nothing is sent to a server.
Output appears here
Practice challenge
Use % to check whether a number is even.