Oct 5, 2020 · In JavaScript, arrays are created with square brackets [...] and allow duplicate elements. Until ES6 (ECMAScript 2015), JavaScript objects and arrays were the most important data structures to handle collections of data.

An HTMLCollection object is an array-like list (collection) of HTML elements. The following code selects all <p> elements in a document: The elements in the collection can be accessed by an index number. To access the second <p> element you can write: Note: The index starts at 0.

Oct 16, 2023 · In this guide, we'll be getting started with Collections in JavaScript for beginners, with practical examples and explanations of Indexed Collections, Keyed Collections and HTML DOM Collections.

Mar 6, 2025 · This chapter introduces collections of data which are indexed by a key; Map and Set objects contain elements which are iterable in the order of insertion. A Map object is a key/value map that can iterate its elements in insertion order. The following code shows some basic operations with a Map.

Mar 19, 2025 · JavaScript does not have an explicit array data type. However, you can use the predefined Array object and its methods to work with arrays in your applications. The Array object has methods for manipulating arrays in various ways, such as joining, reversing, and sorting them.

Jun 26, 2023 · There can be 3 types of collection in Javascript: The indexed collection contains data that is ordered by index and can also be accessed using this index. An index means the position of data....

Oct 14, 2023 · JavaScript provides developers with a variety of built-in collection types that allow for flexible and efficient data storage and manipulation. In this article, we'll explore the most commonly used collections, like arrays, sets, and maps, and learn how to use them with descriptive examples.

Oct 19, 2012 · There are no collections in JS, just objects and arrays. I'd read up on those two types a bit more. Can you tell me difference between these two? See JavaScript Object Literals & Array Literals and When to use an object or an array in javascript? Literals. The [] and {} are called the array and object literals respectively.

JavaScript collections offer specialized alternatives to ordinary objects and arrays. Learn how to manipulate the different collections in this post.

Aug 28, 2024 · JavaScript provides some useful data structures for organizing and working with collections of data. Two of the most useful are Map and Set, added in ES6. In this comprehensive guide, we will explore what Maps and Sets are, how they work, and when you should use them. What is the Map Object?