JavaScript Arrays

An array is a special variable that can hold multiple values under a single name. In JavaScript, arrays can hold values of different data types, and the elements are accessed using numerical indices.

1. Creating Arrays

Arrays can be created using array literals or the Array() constructor.

// Using array literal
const fruits = ["Apple", "Banana", "Orange"];

// Using Array() constructor
const numbers = new Array(1, 2, 3, 4, 5);

2. Accessing Array Elements

Array elements can be accessed using numerical indices, starting from 0.

console.log(fruits[0]); // Output: "Apple"
console.log(numbers[2]); // Output: 3

3. Array Methods

JavaScript provides several built-in methods for working with arrays, such as push(), pop(), shift(), unshift(), slice(), splice(), concat(), join(), indexOf(), and forEach().

// Add elements to the end of an array
fruits.push("Grapes");

// Remove the last element from an array
fruits.pop();

// Remove the first element from an array
fruits.shift();

// Add elements to the beginning of an array
fruits.unshift("Pineapple");

// Find index of an element in an array
console.log(fruits.indexOf("Banana")); // Output: 1

Arrays are versatile data structures in JavaScript, allowing you to store and manipulate collections of values efficiently.