s3 js06.md

Introduction to JavaScript: Lesson 6 - Working with Arrays

Welcome to the sixth lesson in the JavaScript section of our course! In this lesson, we'll explore arrays, a fundamental data structure in JavaScript that allows you to store and manipulate collections of values.

Introduction to Arrays An array is an ordered list of values that can include numbers, strings, objects, and even other arrays.

Creating Arrays You can create an array using square brackets and placing values separated by commas inside.

let numbers = [1, 2, 3, 4, 5];
let fruits = ["apple", "banana", "orange"];

Accessing Array Elements You can access array elements using their index. Remember that arrays are zero-indexed, so the first element is at index 0.

console.log(numbers[0]); // Output: 1
console.log(fruits[1]);  // Output: banana

Modifying Array Elements You can modify array elements by assigning new values to specific indices.

fruits[2] = "grape";
console.log(fruits); // Output: ["apple", "banana", "grape"]

Array Methods JavaScript provides various methods for manipulating arrays, such as:

• push(): Add elements to the end of the array.
• pop(): Remove the last element from the array.
• shift(): Remove the first element from the array.
• unshift(): Add elements to the beginning of the array.
• splice(): Add or remove elements at a specific index.

Iterating Through Arrays You can use loops to iterate through arrays and perform operations on each element.

for (let i = 0; i < numbers.length; i++) {
    console.log(numbers[i]);
}

Your Task: Shopping List For this lesson's assignment, create a JavaScript program that simulates a shopping list. Allow the user to add items to the list, remove items, and display the updated list after each operation.

Conclusion Congratulations! You've completed the sixth lesson in the JavaScript section. You've gained a solid understanding of arrays, a fundamental data structure in JavaScript. Arrays allow you to store collections of data and manipulate them efficiently. In the next lesson, we'll explore how to work with objects, another important concept in JavaScript. Keep up the great work on your web development journey!