What is a JavaScript library?

A JavaScript library is a collection of ready-made functions and/or classes created using the JS programming language. Netscape was the first company to develop it and implement it in its browser. Later, Mozilla made a great contribution to the development of Java.

Having a specific JavaScript library, a developer can use already created and tested scripts to make an application, just like builders use bricks to build a house. Moreover, such ready-made scripts can be used as independent elements or become a part of more complex functions.

Currently, there are many JS libraries that can be divided into:

  • large-scale databases with all common widgets, abbreviations and polyfills;
  • highly specialized databases for performing specific tasks, such as creating diagrams, animations, mathematical functions, etc.

The JavaScript scripting library makes life easier for all developers, regardless of their skill level. For example, beginners can use ready-made solutions that they can’t create themselves yet, while professionals can use them to save their time and effort.

Best JavaScript libraries and their description

Among the large selection of ready-made collections, it can be difficult to choose only one. To solve this problem, look at the list of the most popular Javascript libraries:

  • LitElement simplifies the development of lightweight web components. It uses ready-made lit-html templates (web applications with asynchronous rendering).
  • Data-fns is an alternative version of the outdated Moment.js. It contains tools for parsing, formatting, and processing JS data.
  • RxJS is a library of ready-made React extensions useful for building event-driven and asynchronous applications.
  • Yup allows programmers to take advantage of application development by implementing a schema builder to model branched and interconnected validations.
  • Agenda.js is a lightweight version of the Node.js task scheduling library based on MongoDB, a system for managing various databases.
  • Bull is a Java script library that simplifies working with Redis databases. Bull was written entirely in Typescript, but it can also be used with the Vanilla JS framework.
  • Stocket.io is a library used to develop web applications and facilitate real-time communication. It provides bi-directional communication between client and server, and supports message naming, multiplexing, and disconnect search.
What is a framework?

Developers often use the term “framework”. But what does it mean in programming and what is it used for?

In simple terms, a programming framework is a software foundation. It never changes regardless of configurations and contains elements with a variable part attached to them. A framework defines the overall architecture for conceptual models, software systems and applications. It forms a default behavior, a framework that can later be extended or modified to meet the requirements of the task.

This is where it differs from a library, which consists of programs with similar functionality that do not affect the architecture of the software product under development.

Simple Example

A simple example will help you quickly understand the essence of frameworks. Let’s say you plan to build a house. In this case, you have two options: to develop your project from scratch or use a ready-made one. The latter allows you to customize the project by experimenting with the layout, but without touching bearing walls.

The main difference between your own and a ready-made project is that in the latter everything has already been taken into account: utility system, wall insulation, best options for pouring concrete for a foundation and many other important details, that professional architects usually deal with. Having a pre-created and well-thought-out basis, you will get a cozy and original house built within the framework of an initially created ready-made project.

This example shows pretty well what a framework is and what its role in programming is. Programmers use it as a ready-made software skeleton which can be filled with any code. As a result, they lose in variability, but their software environment functions more stably.