Lesson 7 of 20
Functions
Write reusable logic with function declarations and arrow functions.
Introduction
Functions receive inputs through parameters and may return a result.
Arrow functions provide a compact syntax that is common in modern React code.
Key insight
Write reusable logic with function declarations and arrow functions.
Example
const add = (a, b) => a + b;
console.log(add(4, 6));This example shows the core functions idea in a small, runnable program.
Real-world example
Functions appears in everyday application code, scripts and APIs.
Test yourself
2-question check
1
What is the main idea in Functions?
2
Where can functions 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
Write an arrow function that converts minutes to seconds.