Lesson 8 of 20
Arrays & Objects
Model collections and structured data.
Introduction
Arrays hold ordered values and objects group related properties under named keys.
These structures are foundational when working with API responses and React state.
Key insight
Model collections and structured data.
Example
const skills = ["React", "JavaScript"];
const user = { name: "Asha", city: "Kathmandu" };
console.log(user.city);This example shows the core arrays & objects idea in a small, runnable program.
Real-world example
Arrays & Objects appears in everyday application code, scripts and APIs.
Test yourself
2-question check
1
What is the main idea in Arrays & Objects?
2
Where can arrays & objects 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
Create an array of three tools and map over it to print each one.