#react js development react js development services

[softradix]

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[cerulity]

I'm done pretending that Node is the issue. I'm done pretending it's just React that took it too far. I'm done pretending that the language is serviceable. JavaScript is a fundamentally broken language that shouldn't be used for any non-trivial software development. Quite literally everything is done at runtime, it has no type system, there's no formal constraints you can impose, its memory management scheme is completely out of your control, and it's bare compared to other languages.

And if it knew its place and stayed in the embedded scripting environment, it would be perfectly okay. So someone tell me why this fucking language is used for LITERALLY EVERYTHING.

Nearly every single piece of software made in JavaScript I've used has been slow, subpar, bloated, or straight up dysfunctional.

The environment is also fragmented as all hell, and vulnerabilities and issues seem to pop up all the time.

Modern AOT languages and tooling beat it out the entire way. There's a reason RedoxOS applications launch faster, and it might partially be because of the architecture of the operating system, but I'd wager it's because they didn't use a shitty language with 7 total types and 2 nulls and used something actually built for proper modern application development.

Not just AOT, but other languages end up on top. Java I would actually recommend despite my bias, because it has a proper type system with an albeit dated but still solid system of inheritance and interfaces. C# is pretty nice; I see it as a superset of Java where the environment advantage is equal. Go I don't personally enjoy, but it's definitely a proper and modern option. I use Rust, so I'm inclined to include it for its affinely-typed approach to move semantics and concurrency by default through exclusive mutability, but I concur. OCaml I've heard is quite a nice language; I haven't tried it but it seems nicely made. Zig is one I've used, and it's one that I really respect the design and philosophy of. Kotlin seems like dusted-off Java, which is appreciable. Dart (and the Flutter library for it) are fantastic for UI. ALL OF THESE are MILES better than JavaScript. JS is TOO simple, so much so that it gets in the way of proper software system creation.

JavaScript is a stain on humanity. An encumbrance to the progression of software development. I hate it so FUCKING MUCH.

[creativewebdesignexperts]

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[huygensblog]

Vanilla JS is great until you have to start using it in real life world. Here are some examples of what's really important when working on highly scalable web applications

Maintainbility

Debuggability

A/B testing

Understnding customer needs

Issue investigations and gradual rollouts

Design decisions - cost vs revenue analysis

Monetization

and many many others

As you can see I have barely touched the actual JS framework to be used. While technical decisions do matter, pushing Vanilla JS because you are unable to fathom the breath of challenges faced by services like Twitter, just speaks about your shortcomings.

There is a reason Node.js has become popular for backend development instead of devs whipping out their own V8 based JS runtimes. There are more important shit to be dealth with. React will work just fine and spending inordinate amount of time deciding which frontend JS framework to use ends up becoming nothing more than bikeshedding.

[arcuetechnologies]

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Arcue Technologies a venture of Arcue Marketing offering IT services since 2013. Arcue Technologies offer Services in Website Development, Web Application development, Mobile Application Development and Digital Media Marketing.

                     Web Development Arcue Technologies offer both Dynamic and Static websites. At, Arcue Technologies we have developed our very own Content Management System (CMS) which can be integrated to any website and very easy to use.

                    Software Development Arcue Technologies have a great expertise in Software Development. We have developed number of software for our clients which belongs to different industry verticals like Hotel & Catering, Manufacturing, Retails, Textile Mills, just to name a few. We also offer number of customized software, which can save time and money.

                 Mobile Application Development             Arcue Technologies develop Mobile Applications in Android and IOS. We also do cross platform development in React JS.

              Digital Media Marketing In digital media marketing, we offer services in Social Media Marketing (SMM) and Search Engine Optimization (SEO).

[connectinfo1999]

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[rotansharma]

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[javascript]

How we wrote our own Service Worker

As we continue the process of reinvigorating Tumblr's frontend web development, we're always on the lookout for modern web technologies, especially ones that make our mobile site feel faster and more native. You could have guessed that we are making the mobile dashboard into a progressive app when we open-sourced our webpack plugin to make web app manifests back in August. And you would've been right. But to make a high quality progressive web app, you need more than just a web app manifest—you also need a service worker.

What is a service worker?

A service worker is a helper script that a page registers with the browser. After it is registered (some people like to also call it "installed"), the browser periodically checks the script for changes. If any part of the script contents changes, the browser reinstalls the updated script.

Service workers are most commonly used to intercept browser fetches and do various things with them. https://serviceworke.rs has a lot of great ideas about what you can do with service workers, with code examples. We decided to use our service worker to cache some JS, CSS, and font assets when it is installed, and to respond with those assets when the browser fetches any of them.

Using a service worker to precache assets

You might be wondering "why would you want to pre-cache assets when the service worker is installed? Isn't that the same thing that the browser cache does?" While the browser cache does cache assets after they're requested, our service worker can cache assets before they're requested. This greatly speeds up parts of the page that we load in asynchronously, like the notes popover, or blogs that you tap into from the mobile dashboard.

While there are open-source projects that generate service workers to pre-cache your assets (like, for example, sw-precache), we chose to build our own service worker. When I started this project, I didn't have any idea what service workers were, and I wanted to learn all about them. And what better way to learn about service workers than building one?

How our service worker is built

Because the service worker needs to know about all of the JS, CSS, and font assets in order to pre-cache them, we build a piece of the service worker during our build phase. This part of the service worker changes whenever our assets are updated. During the build step, we take a list of all of the assets that are output, filter them down into just the ones we want to pre-cache, and write them out to an array in a JS file that we call sw.js.

That service worker file importScripts()'s a separate file that contains all of our service worker functionality. All of the service worker functionality is built separately and written in TypeScript, but the file that contains all of our assets is plain JavaScript.

We decided to serve our service worker directly from our node.js app. Our other assets are served using CDNs. Because our CDN servers are often geographically closer to our users, our assets load faster from there than they do from our app. Using CDNs also keeps simple, asset-transfer traffic away from our app, which gives us space us to do more complicated things (like rendering your dashboard with React).

To keep asset traffic that reaches our app to a minimum, we tell our CDNs not to check back for updates to our assets for a long time. This is sometimes referred to as caching with a long TTL (time to live). As we know, cache-invalidation is a tough computer science problem, so we generate unique filenames based on the asset contents each time we build our assets. That way, when we request the new asset, we know that we're going to get it because we use the new file name.

Because the browser wants to check back in with the service worker script to see if there are any changes, caching it in our CDNs is not a good fit. We would have to figure out how to do cache invalidation for that file, but none of the other assets. By serving that file directly from our node.js application, we get some additional asset-transfer traffic to our application but we think it's worth it because it avoids all of the issues with caching.

How does it pre-cache assets?

When the service worker is installed, it compares the asset list in sw.js to the list of assets that it has in its cache. If an asset is in the cache, but not listed in sw.js, the asset gets deleted from the cache. If an asset is in sw.js, but not in the service worker cache, we download and cache it. If an asset is in sw.js and in the cache, it hasn't changed, so we don't need to do anything.

// in sw.js

self.ASSETS = [

  'main.js',

  'notes-popover.js',

  'favorit.woff'

];

// in service-worker.ts

self.addEventListener('install', install);

const install = event => event.waitUntil(

  caches.open('tumblr-service-worker-cache')

    .then(cache => {

      const currentAssetList = self.ASSETS;

      const oldAssets = /* Instead of writing our own array diffing, we use lodash's */;

      const newAssets = /* differenceBy() to figure out which assets are old and new */;

      return Promise.all([ ...oldAssets.map(oldAsset => cache.delete(oldAsset)), cache.addAll(newAssets)]);

  });

);

We launched 🚀

Earlier this month, we launched the service worker to all users of our mobile web dashboard. Our performance instrumentation initially found a small performance regression, but we fixed it. Now our mobile web dashboard load time is about the same as before, but asynchronous bundles on the page load much faster.

We fixed the performance regression by improving performance of the service worker cache. Initially, we naively opened the service worker cache for every request. But now we only open the cache once, when the service worker starts running. Once the cache is opened, we attach listeners for fetch requests, and those closures capture the open cache in their scope.

// before

self.addEventListener('fetch', handleFetch);

const handleFetch = event =>

  event.respondWith(

    caches.open('tumblr-service-worker-cache')

      .then(cache => cache.match(request)

      .then(cacheMatch => cacheMatch

        ? Promise.resolve(cacheMatch)

        : fetch(event.request)

      )

    )

  );

// now

caches.open('tumblr-service-worker-cache')

  .then(cache =>

    self.addEventListener('fetch', handleFetch(cache));

const handleFetch = openCache => event =>

  event.respondWith(

    openCache.match(request)

      .then(cacheMatch => cacheMatch

        ? Promise.resolve(cacheMatch)

        : fetch(event.request)

      )

  );

Future plans

We have lots of future plans to make the service worker even better than it is now. In addition to pre-emptive caching, we would also like to do reactive caching, like the browser cache does. Every time an asset is requested that we do not already have in our cache, we could cache it. That will help keep the service worker cache fresh between installations.

We would also like to try building an API cache in our service worker, so that users can view some stale content while they're waiting for new content to load. We could also leverage this cache if we built a service-worker-based offline mode. If you have any interest in service workers or ideas about how Tumblr could use them in the future, we would love to have you on our team.

- Paul / @blistering-pree