Comment convertir un fichier JSON en tableau dans React

Habituellement, les fichiers JSON contiennent un tableau, et il est nécessaire de mapper efficacement le tableau pour que les données de ses objets soient consommées dans le composant. La source du fichier JSON peut provenir de n'importe quoi, soit d'un fichier JSON local, soit d'un appel réseau. Ce guide montrera comment obtenir les données JSON sous forme de tableau et les analyser ou accéder au tableau JSON à partir du fichier local.

Convertir JSON en tableau en utilisant `json.parse()`

Le fichier JSON contient généralement un accessoire clé représentant l'arborescence de l'objet à l'intérieur du contenu du fichier. Si vous souhaitez utiliser les données JSON avec la clé, la parse()fonction peut être utilisée.

La parse()fonction prend l'argument de la source JSON et le convertit au format JSON, car la plupart du temps, lorsque vous récupérez les données du serveur, le format de la réponse est la chaîne.

JSON.parse(JSON_source)

Assurez-vous qu'il a une valeur de chaîne provenant d'un serveur ou de la source locale. Si tel est le cas, la fonction d'analyse fonctionnera.

Pour suivre l'exemple de ce guide, créez une valeur d'état avec une valeur de chaîne composée d'un tableau d'éléments.

constructor(props) {
    super(props);
    this.state = {
        stringData: '["VALUE1", "VALUE2", "VALUE3", "VALUE4", "VALUE5"]'
    };
}

La variable d'état appelée stringDataa une valeur de chaîne qui contient maintenant le tableau d'éléments. Cela aiderait si vous utilisiez la fonction parse(), qui convertit la valeur de chaîne en un objet JavaScript.

const valuesArray = JSON.parse(this.state.stringData);

Après avoir analysé la valeur, elle peut être utilisée pour le rendu. Vous trouverez ci-dessous l'exemple complet de l'analyse JSON.

import React, { Component } from "react";

export class Example1 extends Component {
    constructor(props) {
        super(props);
        this.state = {
            stringData: '["VALUE1", "VALUE2", "VALUE3", "VALUE4", "VALUE5"]'
        };
    }

    render() {
        // Parsed valued from string
        const valuesArray = JSON.parse(this.state.stringData);

        return (
            <>
                <div>
                    <h3>Using local JSON file Array</h3>
                    <ul>
                        {valuesArray.map(item => {
                            return <li>{item}</li>;
                        })}
                    </ul>
                </div>
            </>
        );
    }
}

export default Example1;

Après avoir obtenu les valeurs du serveur, la parse()fonction a été utilisée. Les données d'analyse sous forme de tableau peuvent être mappées à l'aide de la fonction .map(), qui itère sur le tableau d'éléments.

Convertir JSON en tableau à partir d'un fichier local

Il est possible que le fichier JSON ait besoin d'être utilisé à partir de la source locale et qu'il contienne également un tableau d'éléments ou d'objets.

Pour convertir le tableau du fichier JSON local en objet basé sur JavaScript, vous pouvez utiliser l'instruction d'importation ES6 pour importer le fichier JSON local et l'utiliser dans les composants existants.

Tout fichier JSON peut être importé depuis le répertoire local.

import Students from "./Students";

Ici, dans l'instruction d'importation ci-dessus, le Studentsreprésentera la source du fichier JSON et vous devez fournir son chemin à partir de l'endroit où le fichier JSON existe dans le répertoire du projet. Vous trouverez ci-dessous un exemple Students.jsonde fichier que vous pouvez utiliser comme démo.

{
  "students": [
    {
      "name": "Student 1",
      "age": "22",
      "department": "Information Technology",
      "rollno": "123"
    },
    {
      "name": "Student 2",
      "age": "21",
      "department": "Computer Engineering",
      "rollno": "456"
    },
    {
      "name": "Student 3",
      "age": "23",
      "department": "Information Technology",
      "rollno": "789"
    }
  ]
}

Après avoir importé le fichier JSON à partir de la source locale, vous pourrez utiliser l'objet source. Ceci est également utilisé pour extraire les données, comme indiqué ci-dessous.

{Students.students.map((item, i) => (
    <tr key={i}>
        <td>{item.name}</td>
        <td>{item.department}</td>
    </tr>
))}

Students.studentscontient les différents objets avec les détails sur chaque élève. Mais avec l'objet JSON, il existe une fonction supplémentaire appelée .map()utilisée pour mapper le tableau d'objets à partir de la source.

Vous trouverez ci-dessous l'exemple complet d'obtention de la source JSON et de mappage du tableau d'objets.

import React, { Component } from "react";
// Getting local JSON file
import Students from "./Students";

export class Example2 extends Component {
    render() {
        return (
            <>
                <div>
                    <table border="2">
                        <tbody>
                            <tr>
                                <th>Name</th>
                                <th>Department</th>
                            </tr>
                            // Mapping array of objects
                            {Students.students.map((item, i) => (
                                <tr key={i}>
                                    <td>{item.name}</td>
                                    <td>{item.department}</td>
                                </tr>
                            ))}
                        </tbody>
                    </table>
                </div>
            </>
        );
    }
}

export default Example2;

Les façons de consommer des données JSON et, plus précisément, un tableau d'éléments ou d'objets s'intègrent facilement à l'aide des fonctions parse()et map().

JSON est un format de fichier approprié pour l'échange de données entre le client et le serveur et contient la paire clé-valeur sous forme de valeur de chaîne. La fonction JavaScript parse()convertit la chaîne en objet JavaScript et map()parcourt un tableau d'objets.

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How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

• Performance: It delivers optimal performance.
• Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
• UI design: React Native enables you to design simple and responsive UI for your mobile app.
• 3rd party plugins: This framework supports 3rd party plugins.
• Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

• Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
• Near-native user experience: React Native provides several native components, and these are platform agnostic.
• The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

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What is JSON? | JSON Objects and JSON Arrays | Working with JSONs Tutorial

In this video, we work with JSONs, which are a common data format for most web services (i.e. APIs). Thank you for watching and happy coding!

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http://maps.googleapis.com/maps/api/geocode/json?address=13+East+60th+Street+New+York,+NY

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How to Select and Hire the Best React JS and React Native Developers?

Since March 2020 reached 556 million monthly downloads have increased, It shows that React JS has been steadily growing. React.js also provides a desirable amount of pliancy and efficiency for developing innovative solutions with interactive user interfaces. It’s no surprise that an increasing number of businesses are adopting this technology. How do you select and recruit React.js developers who will propel your project forward? How much does a React developer make? We’ll bring you here all the details you need.

What is React.js?

Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.

React vs React Native

• React Native is a platform that uses a collection of mobile-specific components provided by the React kit, while React.js is a JavaScript-based library.
• React.js and React Native have similar syntax and workflows, but their implementation is quite different.
• React Native is designed to create native mobile apps that are distinct from those created in Objective-C or Java. React, on the other hand, can be used to develop web apps, hybrid and mobile & desktop applications.
• React Native, in essence, takes the same conceptual UI cornerstones as standard iOS and Android apps and assembles them using React.js syntax to create a rich mobile experience.

What is the Average React Developer Salary?

In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.

* React.js Developer Salary by Country

• United States- $120,000
• Canada - $110,000
• United Kingdom - $71,820
• The Netherlands $49,095
• Spain - $35,423.00
• France - $44,284
• Ukraine - $28,990
• India - $9,843
• Sweden - $55,173
• Singapore - $43,801

In context of software developer wage rates, the United States continues to lead. In high-tech cities like San Francisco and New York, average React developer salaries will hit $98K and $114per year, overall.

However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.

It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.

As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.

How to Hire React.js Developers?

• Conduct thorough candidate research, including portfolios and areas of expertise.
• Before you sit down with your interviewing panel, do some homework.
• Examine the final outcome and hire the ideal candidate.

Why is React.js Popular?

React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.

React is scalable. it utilises a single language, For server-client side, and mobile platform.

React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.

React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.

Is there a market for React.js programmers?
The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.

Final thoughts:

As you’ve seen, locating and Hire React js Developer and Hire React Native developer is a difficult challenge. You will have less challenges selecting the correct fit for your projects if you identify growing offshore locations (e.g. India) and take into consideration the details above.

If you want to make this process easier, You can visit our website for more, or else to write a email, we’ll help you to finding top rated React.js and React Native developers easier and with strives to create this operation

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React Starter Kit: Build Web Apps with React, Relay and GraphQL.

React Starter Kit — "isomorphic" web app boilerplate   

React Starter Kit is an opinionated boilerplate for web development built on top of Node.js, Express, GraphQL and React, containing modern web development tools such as Webpack, Babel and Browsersync. Helping you to stay productive following the best practices. A solid starting point for both professionals and newcomers to the industry.

See getting started guide, demo, docs, roadmap  |  Join #react-starter-kit chat room on Gitter  |  Visit our sponsors:

 

Hiring

Getting Started

• Follow the getting started guide to download and run the project (Node.js >= 8.16.2)
• Check the code recipes used in this boilerplate, or share yours

Customization

The master branch of React Starter Kit doesn't include a Flux implementation or any other advanced integrations. Nevertheless, we have some integrations available to you in feature branches that you can use either as a reference or merge into your project:

• feature/redux (PR) — isomorphic Redux by Pavel Lang (see how to integrate Redux) (based on master)
• feature/apollo (PR) — isomorphic Apollo Client by Pavel Lang (see Tracking PR #1147) (based on feature/redux)
• feature/react-intl (PR) — isomorphic Redux and React Intl by Pavel Lang (see how to integrate React Intl) (based on feature/apollo)
• feature/apollo-pure (PR) — Apollo devtools and TypeScript integration by piglovesyou (based on master)

You can see status of most reasonable merge combination as PRs labeled as TRACKING

If you think that any of these features should be on master, or vice versa, some features should removed from the master branch, please let us know. We love your feedback!

Comparison

	React Starter Kit	React Static Boilerplate	ASP.NET Core Starter Kit
App type	Isomorphic (universal)	Single-page application	Single-page application
Frontend
Language	JavaScript (ES2015+, JSX)	JavaScript (ES2015+, JSX)	JavaScript (ES2015+, JSX)
Libraries	React, History, Universal Router	React, History, Redux	React, History, Redux
Routes	Imperative (functional)	Declarative	Declarative, cross-stack
Backend
Language	JavaScript (ES2015+, JSX)	n/a	C#, F#
Libraries	Node.js, Express, Sequelize, GraphQL	n/a	ASP.NET Core, EF Core, ASP.NET Identity
SSR	Yes	n/a	n/a
Data API	GraphQL	n/a	Web API

Backers

♥ React Starter Kit? Help us keep it alive by donating funds to cover project expenses via OpenCollective or Bountysource!

 

How to Contribute

Anyone and everyone is welcome to contribute to this project. The best way to start is by checking our open issues, submit a new issue or feature request, participate in discussions, upvote or downvote the issues you like or dislike, send pull requests.

Learn More

• Getting Started with React.js
• Getting Started with GraphQL and Relay
• React.js Questions on StackOverflow
• React.js Discussion Board
• Flux Architecture for Building User Interfaces
• Enzyme — JavaScript Testing utilities for React
• Flow — A static type checker for JavaScript
• The Future of React
• Learn ES6, ES6 Features

Related Projects

• GraphQL Starter Kit — Boilerplate for building data APIs with Node.js, JavaScript (via Babel) and GraphQL
• Membership Database — SQL schema boilerplate for user accounts, profiles, roles, and auth claims
• Babel Starter Kit — Boilerplate for authoring JavaScript/React.js libraries

Support

• #react-starter-kit on Stack Overflow — Questions and answers
• #react-starter-kit on Gitter — Watch announcements, share ideas and feedback
• GitHub issues, or Scrum board — File issues, send feature requests
• appear.in/react — Open hours! Exchange ideas and experiences (React, GraphQL, startups and pet projects)
• @koistya on Codementor, or Skype — Private consulting

License

Copyright © 2014-present Kriasoft, LLC. This source code is licensed under the MIT license found in the LICENSE.txt file. The documentation to the project is licensed under the CC BY-SA 4.0 license.

---

Author: kriasoft
Source Code: https://github.com/kriasoft/react-starter-kit
License: MIT License

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