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Home > Programming > Design Patterns > Hands-On Design Patterns with React Native
Hands-On Design Patterns with React Native
Hands-On Design Patterns with React Native

Hands-On Design Patterns with React Native: Proven techniques and patterns for efficient native mobile development with JavaScript

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Hands-On Design Patterns with React Native

View Patterns

One very demanding skill is writing good view code the first time around. It comes with experience and becomes almost automatic at some point. Hence, it is vital to do it right from the beginning. In this chapter, we will explore best practices and go through the React JSX patterns that you already used in the previous chapter. We will also focus on the broader spectrum of built-in components, which include input and forms. At the very end, I will show you a nice tool called a linter that is essential for any new frontend project.

In this chapter, you will learn how to do the following:

  • Write concise JSX
  • Use common React Native built-in components
  • Create simple forms using TextInput
  • Distinguish between controlled and uncontrolled input
  • Create error boundaries
  • Eliminate Mixins from your code base
  • Set up a linter to enforce your code style guide
...

Technical requirements

In this chapter, you will learn about various patterns, along with their code snippets. However, to run them, you will need the Create React Native App package. I have separated every example into a standalone application that you can launch on your phone or simulator.

To follow along with the examples in this chapter, you will need the following:

Follow the installation and running instructions from the GitHub page to get started.

Introduction to JSX

We have been using JSX so far, but what does it mean? JSX stands for JavaScript extension. How can it be an extension?

As you probably know, ECMAScript is also an extension to JavaScript (kind of). ECMAScript transpiles to JavaScript. What does this mean? It means that it just transforms ECMAScript code into valid JavaScript code. JavaScript misses out on many features that we like from ECMAScript, such as arrow functions, classes, and destructuring operators.

JSX works the same way. JSX is being transpiled to JavaScript, and its main feature is creating React elements based on the markup you write.
Could we use only JavaScript? Yes. Is it worth it? Most likely not.

Let's check this out in action. This is JSX and ECMAScript:

export default () => <Text style={{marginTop: 30}}>Example Text!</Text>

Now, compare this to pure JavaScript:

export...

Built-in components you need to know about

React Native is growing fast and changing often. I have selected a curated list of components that are likely to stay within the API for a long time. We will spend some time learning them so that we will be able to proceed faster later on in this book. Any further examples will rely on these components and will assume that you know what these components are for.

The ScrollView component

So far, we know about three components: View , Text, and StyleSheet. Now, imagine a case where we have a lot of rows to show in the application—something such as table of information pops into my mind. Obviously, it will be a long table, but the screen is small, so we will make it scrollable...

Building forms

In this section, we will explore how we can handle text input from users. Traditional means of collecting input from so-called forms is divided into two major ways: controlled and uncontrolled. In a native environment, this means either handling any keypress on the React Native side (controlled input), or letting it be handled on the native system level and collecting data in React on demand (uncontrolled input).

If you come from a web development background, please note that, at the time of writing this book, there is no form component, and I don't see it coming. There are also limitations to refs and what you can do with them. For instance, you cannot ask a ref to a TextInput for its current value. Please follow the following two subsections for more details. You can also use custom libraries, but I will not discuss such solutions here as these tend to change...

Introduction to error boundaries

This is quite an overlooked feature that came with React version 16. As you should already know, JavaScript can throw errors. Such errors should not break your app, especially if it is from the financial sector. The regular imperative solution from JavaScript is a try-catch block:

try {
    // helloWorld function can potentially throw error
    helloWorld();
} catch (error) {
    // If helloWorld throws error
    // we catch it and handle gracefully
    // ...
}

This approach is hard to use with JSX. Hence, the React team developed an alternative solution for React views. It's called Error Boundaries. Any class component can become an ErrorBoundary component, given that it implements the componentDidCatch function:

class AppErrorBoundary extends React.Component {
    state = { hasError: false };

    componentDidCatch() {
        this.setState({ hasError...

Why Mixins are anti-patterns

With a Mixin pattern, you mix in a certain behavior with your React components. You kind of inject a behavior for free, and you can reuse the same Mixin in different components. This all sounds great, but it isn't – and you will easily find articles on why. Here, I want to show you this anti-pattern by example.

Mixin example

Instead of shouting Mixins are harmful, let's create a component that is using them and look at what the issues are. Mixins are deprecated, so the first step is finding a way to use them. It turns out that they still live in a legacy way of creating React class components. Previously, instead of ES6 classes, there was a special function called createReactClass...

Linters and code style guide

In this section, we will take a look at quite a different set of patterns, namely, patterns on how to structure your code. Over the years, there have been tens of approaches to styling, and the general rule is this: the more people, the more preferred ways there are.

Hence, the crucial point of setting up the project is selecting your style guide, and your set of defined and precise rules. This will save enormous amounts of time for you as it removes any potential discussion.

In an era of advanced IDEs, it is possible to quickly reformat a whole code base in seconds. This will come in handy in case you need to allow for small future changes to the style of your code.

Adding a linter to create a React Native app

...

Summary

In this chapter, we learned about view patterns that will be very useful later on in this book. Now we know how to write concise JSX and type check components. We can also compose common built-in components from the React Native library. When we need to, we can write the markup of a simple form and know how to handle the input. We compared controlled and uncontrolled inputs and dove deep into how TextInput works. If some errors occur, our error boundaries will handle the problem.

Finally, we made sure that we have a strict style guide on how to write React Native code, and we enforced these rules by using ESLint.

In the next chapter, we will work on styling the components we have learned. Thanks to this, our application will look nice and professional.

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Key benefits

  • Mobile development in React Native should be done in a reusable way.
  • Learn how to build scalable applications using JavaScript patterns that are battle tested.
  • Try effective techniques on your own using over 80 standalone examples.

Description

React Native helps developers reuse code across different mobile platforms like iOS and Android. This book will show you effective design patterns in the React Native world and will make you ready for professional development in big teams. The book will focus only on the patterns that are relevant to JavaScript, ECMAScript, React and React Native. However, you can successfully transfer a lot of the skills and techniques to other languages. I call them “Idea patterns”. This book will start with the most standard development patterns in React like component building patterns, styling patterns in React Native and then extend these patterns to your mobile application using real world practical examples. Each chapter comes with full, separate source code of applications that you can build and run on your phone. The book is also diving into architectural patterns. Especially how to adapt MVC to React environment. You will learn Flux architecture and how Redux is implementing it. Each approach will be presented with its pros and cons. You will learn how to work with external data sources using libraries like Redux thunk and Redux Saga. The end goal is the ability to recognize the best solution for a given problem for your next mobile application.

Who is this book for?

The ideal target audience for this book are people eager to learn React Native design patterns who already know the basics of JavaScript. We can assume that the target audience already knows how to write Hello World in JavaScript and know what are the functions, recursive functions, JavaScript types and loops.

What you will learn

  • Explore the design Patterns in React Native
  • Learn the best practices for React Native development
  • Explore common React patterns that are highly used within React Native development
  • Learn to decouple components and use dependency injection in your applications
  • Explore the best ways of fetching data from the backend systems
  • Learn the styling patterns and how to implement custom mobile designs
  • Explore the best ways to organize your application code in big codebases
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Length: 302 pages
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Language : English
ISBN-13 : 9781788994460
Vendor :
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Category :
Programming
Languages :
JavaScript
Concepts :
Design Patterns
Tools :
React

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Table of Contents

12 Chapters
React Component Patterns Chevron down icon Chevron up icon
React Component Patterns
Stateless and stateful components
Testing components on high-level patterns
Presentational components
Container component
Summary
View Patterns Chevron down icon Chevron up icon
View Patterns
Technical requirements
Introduction to JSX
Built-in components you need to know about
Building forms
Introduction to error boundaries
Why Mixins are anti-patterns
Linters and code style guide
Summary
Styling Patterns Chevron down icon Chevron up icon
Styling Patterns
Technical requirements
How React Native styles work
Using the Flexible Box pattern
React Native animated
Summary
Flux Architecture Chevron down icon Chevron up icon
Flux Architecture
One-direction dataflow pattern
Introduction to Flux
Flux by example
Detailed Flux diagram
What are side effects?
Summary
Questions
Further reading
Store Patterns Chevron down icon Chevron up icon
Store Patterns
Using Redux stores
Redux as a pattern
Creating an alternative with MobX
Comparing Redux and MobX
Using system storage in React Native
Effect patterns
Summary
Further reading
Data Transfer Patterns Chevron down icon Chevron up icon
Data Transfer Patterns
Preparation
Fetching data with the built-in function
The Thunk pattern and Redux Thunk
The saga pattern and Redux Saga
Summary
Further reading
Navigation Patterns Chevron down icon Chevron up icon
Navigation Patterns
React Native navigation alternatives
React Navigation
React Native Navigation
Summary
Further reading
JavaScript and ECMAScript Patterns Chevron down icon Chevron up icon
JavaScript and ECMAScript Patterns
JavaScript and functional programming
ES6 map, filter, and reduce
The iterator pattern
Selectors
Learning functions from the Ramda library
Summary
Further reading
Elements of Functional Programming Patterns Chevron down icon Chevron up icon
Elements of Functional Programming Patterns
Mutable and immutable objects
Pure functions
Everything but monads
Higher-order functions
Functional languages aside
Summary
Further reading
Managing Dependencies Chevron down icon Chevron up icon
Managing Dependencies
The singleton pattern
ES6 modules and beyond
DI with React context
Managing the code base
Summary
Further reading
Type Checking Patterns Chevron down icon Chevron up icon
Type Checking Patterns
Introduction to types
Understanding TypeScript
Immutability with TypeScript
Summary
Further reading
Other Books You May Enjoy Chevron down icon Chevron up icon
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Darron Brown Dec 30, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
If you are new to React Native I would advise you not to purchase this book. The book is poorly written and the code being used is highly complex.If you are a seasoned React Native Developer this is a must buy. Although the book is poorly written you should be able to follow the examples and get a feel for what the author is trying to accomplish. You can also google the code source if you get lost. I learned a lot after the 1st chapter.This is a MUST BUY for seasoned developers.
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Filipe Ramos Aug 04, 2020
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Not an very good book. It has some good information on it, but the way it’s presented is not optimal. Some key concepts are not very well explained.Also, if you don’t know JavaScript well enough, you need to start with a different book.Still, it’s worth reading.
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About the author

Profile icon Grzesiukiewicz
Grzesiukiewicz
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Mateusz Grzesiukiewicz has worked on numerous big projects, including an investment banking platform at Goldman Sachs, a Jira project management tool at Atlassian, and a recruitment portal at GoldenLine. All of these projects served millions of people, which made them great opportunities to test scalability and the industry's best design patterns. He strives to popularize the common patterns and help people grow their technology at scale. He has spent hundreds of hours teaching, for instance at a private programming school called Coder's Lab. He has over 5,000 students registered on his online React course on Udemy. He would love to bring programming to every household, hence this bookHands-On Design Patterns with React Native.
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  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela