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Code-splitting is a process that takes bundling to the next level. Bundling is great when you have a small project, but as your project grows, so will your bundle. Eventually, your bundle will be so large that even your bundle loads slowly, thus defeating the whole purpose of bundling. With code-splitting, multiple bundles are created and loaded only when the user needs them, which means we can drastically reduce load times by not loading resources we don’t need.
In the example above, we load one resource that is 2.88MB, and in the example below, we load two resources, an initial parent bundle that is 2.83MB. Then when the user accesses another page, they request a sub-bundle that is 63KB. While this doesn’t seem like much; these numbers are from a very small app, consisting of a few images, that I created to demonstrate bundling for this article. You can imagine how much you could actually reduce your initial bundle size of a larger project by using code-splitting, thus reducing initial load times.
As always, Parcel sticks to the big feature behind its hype, zero configuration. This means we don’t have to create a config file to actually use the feature. Parcel just knows how to handle everything on its end, so all we have to do is use the dynamic import()
function syntax.
For code without a rendered component, it’s simple to just use the dynamic import as follows.
Define logic:
//math.js
export default function add(a, b) {
return a + b;
}
Use logic somewhere else:
//frontpage.js
import("./math").then(math => {
console.log(math.add(1, 2));
});
But if we have a component to render, we need to first define our subcomponent:
// register.js
import React, { Component } from 'react';
export default class Register extends Component {
render() {
return (
<div>
<h1>Register Here</h1>
</div>
);
}
}
Then, in order to use this component somewhere else in our app, we need to use React.lazy
inside a suspense
component by doing this:
import React, { Component, Suspense } from 'react';
const Register = React.lazy(() => import('./JS/mediumSection'));
export default class App extends Component {
render() {
return (
<Suspense fallback={<div>Loading…</div>}>
<Register />
</Suspense>
);
}
}
We need to do this because React.lazy
lets us render a dynamic import as a regular component, and the suspense
component allows for the fallback to be rendered while our component is being loaded.
In a SPA you most likely won’t need code-splitting, but in an app with multiple pages, we might run into the aforementioned bundle slowdown. Code-splitting based on routes is useful because loading code bundles takes time, and users will expect some time to load when switching pages. Also, we won’t be expecting a user to be using elements when re-rendering the whole page, so there is no chance for them to notice a slowdown when interacting with elements.
To code-split based on routes, we wrap our routes in a suspense
component, like this:
import React, { Suspense, lazy } from 'react';
import {
BrowserRouter as Router,
Route,
Switch,
} from 'react-router-dom';
const Home = lazy(() => import('./routes/Home'));
const Register = lazy(() => import('./routes/Register'));
const App = () => (
<Router>
<Suspense fallback={<div>Loading Some Content</div>}>
<Switch>
<Route exact path="/" component={Home} />
<Route path="/register" component={Register} />
</Switch>
</Suspense>
</Router>
);
One downside of code-splitting with React.lazy
is that it currently only supports default exports. If you want to import named exports, you need to create an intermediate module that re-exports it as the default. Also, React.lazy
and suspense
do not support server-side rendering. To code-split a React app while also rendering on the server side, it’s currently recommended to use [@loadable/component](https://loadable-components.com/docs/getting-started/)
.
In my opinion, code-splitting is another awesome tool and a logical upgrade from plain bundling. I hope this article helped you learn something.
Thank you!
#react #reactjs #javascript
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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.
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:
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:
Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.
#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native
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Static code analysis refers to the technique of approximating the runtime behavior of a program. In other words, it is the process of predicting the output of a program without actually executing it.
Lately, however, the term “Static Code Analysis” is more commonly used to refer to one of the applications of this technique rather than the technique itself — program comprehension — understanding the program and detecting issues in it (anything from syntax errors to type mismatches, performance hogs likely bugs, security loopholes, etc.). This is the usage we’d be referring to throughout this post.
“The refinement of techniques for the prompt discovery of error serves as well as any other as a hallmark of what we mean by science.”
We cover a lot of ground in this post. The aim is to build an understanding of static code analysis and to equip you with the basic theory, and the right tools so that you can write analyzers on your own.
We start our journey with laying down the essential parts of the pipeline which a compiler follows to understand what a piece of code does. We learn where to tap points in this pipeline to plug in our analyzers and extract meaningful information. In the latter half, we get our feet wet, and write four such static analyzers, completely from scratch, in Python.
Note that although the ideas here are discussed in light of Python, static code analyzers across all programming languages are carved out along similar lines. We chose Python because of the availability of an easy to use ast
module, and wide adoption of the language itself.
Before a computer can finally “understand” and execute a piece of code, it goes through a series of complicated transformations:
As you can see in the diagram (go ahead, zoom it!), the static analyzers feed on the output of these stages. To be able to better understand the static analysis techniques, let’s look at each of these steps in some more detail:
The first thing that a compiler does when trying to understand a piece of code is to break it down into smaller chunks, also known as tokens. Tokens are akin to what words are in a language.
A token might consist of either a single character, like (
, or literals (like integers, strings, e.g., 7
, Bob
, etc.), or reserved keywords of that language (e.g, def
in Python). Characters which do not contribute towards the semantics of a program, like trailing whitespace, comments, etc. are often discarded by the scanner.
Python provides the tokenize
module in its standard library to let you play around with tokens:
Python
1
import io
2
import tokenize
3
4
code = b"color = input('Enter your favourite color: ')"
5
6
for token in tokenize.tokenize(io.BytesIO(code).readline):
7
print(token)
Python
1
TokenInfo(type=62 (ENCODING), string='utf-8')
2
TokenInfo(type=1 (NAME), string='color')
3
TokenInfo(type=54 (OP), string='=')
4
TokenInfo(type=1 (NAME), string='input')
5
TokenInfo(type=54 (OP), string='(')
6
TokenInfo(type=3 (STRING), string="'Enter your favourite color: '")
7
TokenInfo(type=54 (OP), string=')')
8
TokenInfo(type=4 (NEWLINE), string='')
9
TokenInfo(type=0 (ENDMARKER), string='')
(Note that for the sake of readability, I’ve omitted a few columns from the result above — metadata like starting index, ending index, a copy of the line on which a token occurs, etc.)
#code quality #code review #static analysis #static code analysis #code analysis #static analysis tools #code review tips #static code analyzer #static code analysis tool #static analyzer
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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.
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.
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.
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.
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.
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
#hire-react-js-developer #hire-react-native-developer #react #react-native #react-js #hire-react-js-programmer
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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:
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:
master
)feature/redux
)feature/apollo
)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!
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 |
♥ React Starter Kit? Help us keep it alive by donating funds to cover project expenses via OpenCollective or Bountysource!
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.
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
1621573085
Expand your user base by using react-native apps developed by our expert team for various platforms like Android, Android TV, iOS, macOS, tvOS, the Web, Windows, and UWP.
We help businesses to scale up the process and achieve greater performance by providing the best react native app development services. Our skilled and experienced team’s apps have delivered all the expected results for our clients across the world.
To achieve growth for your business, hire react native app developers in India. You can count on us for all the technical services and support.
#react native app development company india #react native app developers india #hire react native developers india #react native app development company #react native app developers #hire react native developers