Arrays in JavaScript

What is an Array? An array is used to store multiple values in a single variable. An array can store values of the same or different data types. Each individual value stored inside an array is called an element. Without Array: let student1 = "Abi"; let student2 = "Max"; let student3 = "Rohith"; let student4 = "virat"; let student5 = "ABD"; Enter fullscreen mode Exit fullscreen mode Here, separate variables are used to store each student name. With Array: let students = ["Abi", "Max", "Rohith", "virat", "ABD"]; Enter fullscreen mode Exit fullscreen mode Here, all the student names are stored together in a single array called students. Real-World Example An array can be compared to a school bag. A school bag is a single container that can hold multiple items such as: Book Pen Pencil Eraser Scale Enter fullscreen mode Exit fullscreen mode Similarly, an array is a collection of values that can store multiple values together. let schoolBag = ["Book", "Pen", "Pencil", "Eraser", "Scale"]; Enter fullscreen mode Exit fullscreen mode Each individual value inside the array is called an element. For example: let fruits = ["Apple", "Banana", "Mango"]; Enter fullscreen mode Exit fullscreen mode Here: "Apple" → Element "Banana" → Element "Mango" → Element Different Data Types in an Array JavaScript arrays can store different types of values in the same array. let data = ["Arun", 20, true, 25.5]; Enter fullscreen mode Exit fullscreen mode Here: "Arun" → String 20 → Number true → Boolean 25.5 → Number So, an array does not have to contain only one type of value. In simple words, an array is a way to store multiple values of the same or different data types together in a single variable. Why do we use Arrays? To store multiple values in a single variable. To keep related data organized together. To avoid creating separate variables for every value. To make multiple values easier to manage. Arrays can be used with loops to process multiple values. Arrays are commonly used to store collections such as student names, marks, products, prices, and scores. Example: let marks = [80, 75, 90, 85, 70]; Enter fullscreen mode Exit fullscreen mode Here, multiple marks are stored together in the marks array. Arrays are widely used in JavaScript applications whenever a collection of values needs to be stored and processed.