Book Image

JavaScript Design Patterns

By : Hugo Di Francesco
Book Image

JavaScript Design Patterns

By: Hugo Di Francesco

Overview of this book

Unlock the potential of JavaScript design patterns, the foundation for development teams seeking structured and reusable solutions to common software development challenges in this guide to improving code maintainability, scalability, and performance. Discover how these patterns equip businesses with cleaner and more maintainable code, promote team collaboration, reduce errors, and save time and costs. This book provides a comprehensive view of design patterns in modern (ES6+) JavaScript with real-world examples of their deployment in professional settings. You’ll start by learning how to use creational, structural, and behavioral design patterns in idiomatic JavaScript, and then shift focus to the architecture and UI patterns. Here, you’ll learn how to apply patterns for libraries such as React and extend them further to general web frontend and micro frontend approaches. The last section of the book introduces and illustrates sets of performance and security patterns, including messaging and events, asset and JavaScript loading strategies, and asynchronous programming performance patterns. Throughout the book, examples featuring React and Next.js, in addition to JavaScript and Web API examples, will help you choose and implement proven design patterns across diverse web ecosystems, transforming the way you approach development.
Table of Contents (16 chapters)
Part 1:Design Patterns
Part 2:Architecture and UI Patterns
Part 3:Performance and Security Patterns

The render prop pattern

The render prop pattern is apparent when a component allows its consumer to define how a part of that component is rendered, via a function prop. These can be children as a function or another prop, which is a function that takes some parameters and returns JSX.

Render props allow for a level of inversion of control. Although a component could completely encapsulate rendering and business logic, it instead yields control of some parts of the rendering logic to its consumer.

Such inversion of control is useful to share logic without sharing the visuals or actually rendering the UI. Therefore, this pattern is widespread among libraries. A prime example is Formik, which gives consumers flexibility on how to render a form while providing an abstraction over the form’s state management logic.

Use cases

Let’s start with a scenario where we build a CoupledSelect component, which is a wrapper for the select native element. We’ll build...