JavaScript Beginner Day 7: Arrays & Objects

Goal of this Day

Today you will learn:

• How to store multiple values using arrays
• How to group data using objects

By the end, you will be able to organize data efficiently in JavaScript.

Step 1: Arrays

Arrays store multiple values in one variable.

let fruits = ["apple", "banana", "orange"];

console.log(fruits[0]); // apple

Explanation:

• Arrays use square brackets []
• Index starts at 0

Step 2: Objects

Objects store related data as key-value pairs.

let person = {
  name: "John",
  age: 25
};

console.log(person.name); // John

Explanation:

• Objects use curly braces {}
• Data is stored as key: value

Step 3: Combining Arrays and Objects

You can store objects inside arrays.

let people = [
  { name: "John", age: 25 },
  { name: "Alice", age: 30 }
];

console.log(people[0].name); // John

Practice

let fruits = ["apple", "banana", "orange"];
console.log(fruits[0]);

let person = {
  name: "John",
  age: 25
};

Task

Complete the following tasks:

• Create an array of 5 hobbies
• Create an object about yourself

Example:

// Array of hobbies
let hobbies = ["gaming", "coding", "reading", "sports", "music"];

// Object about yourself
let me = {
  name: "Alex",
  age: 18,
  hobby: "coding"
};

console.log(hobbies);
console.log(me);