So if you write... Then y will equal 15, and that's just what we expect, but what happens to y if we then change the value of x to 20?

I build React sites at my day job. It is very much allowed.

As I dug into a bit more, I realized that despite many similarities, there were also some big differences. It is properly written and includes a lot of examples, which will help you understand better how a particular function works. I am not going to retell the information you can easily find online. Vue would always be only the catching-up imitator. Seriously? What i mean with exactly is not only about its functionality or visuality but also i did not used any 3rd party libraries and used their internal APIs to manage a working application. Just behind React and in front of well-established frameworks like Vue.js, Preact, Angular, and Ember. its a bit experimental but it works. Oh, and how easy is it to use with other libs. How to Upgrade Your Existing Website With Responsive Design? Rich Harris, the creator of Svelte, is well aware of the interworkings of React, good and bad. Thanks for the suggestion. Built on Forem — the open source software that powers DEV and other inclusive communities. ( has minor difference). let element = document.createElement("link"); I'll try your starter template. I asked about it in their discord and got ignored. This article will compare some of the more popular reactivity models in the JS ecosystem - especially the ones found in the UI frameworks and libraries. Since it is a desktop application using nw.js, the speed is much appriciated. App files are entry points in both framework. Don't get stuck in the tutorial loop. The declarative nature of React is what allows our UI to be interactive. Svelte uses a "radical new approach" to building UI - it's a compiler that generates code and leaves no traces of the framework at runtime. IMO Ractive hit a really bad timing. Some readers may find this concept as mind-blowing as I do, but others probably have their pitchforks ready at the thought of throwing this at beginners. Thanks! I watched numerous videos by Rich Harris, and his thoughts and explanations convinced me that the new framework is promising and quite useful.

github.com/kazzkiq/svelte-preproce... That's why the svelte compiler has a preprocess option.

Svelte is a Compiler while React uses Virtual DOM. Running effects when state changes can be achieved by simply subscribing to the store using store.subscribe and passing it a function that runs whenever the state changes. When you use reactive declarations to subscribe a variable change, Svelte can not detect mutations on arrays. Internally it uses Reacts context API. Svelte is a one man show, it was developed by Rich Harris.

Svelte exports its bundles into public folder whereas react app put them into build folder. Created by Facebook, React quickly took the web development world by storm and is now the number one front-end framework (depending on who you ask). Overall, I liked what Svelte is providing, the cleanness of the code, the ability to address in vanilla JavaScript, reactivity, and the use of JS/HTML/CSS.

Now doing all my new dev projects on Svelte and I am re-writing one big React app on Svelte.

// it is executed once the value is changed. Svelte VS React. I am aware that using querySelector to get the value of the input is not idiomatic Svelte, but you'll notice I used the same approach for all frameworks/libraries. We can declare derived data by setting a getter function on the object passed to observable - this makes MobX optimise the value by caching the return value and only recomputing it when some observable value used by the getter changes. Build by Rollup with default configuration. You can subscribe any variable easily, but it has some hacky ways to detect array mutations. Also there will be component which will subscribe global store and will show current value whenever it changed, Both Svelte and React source codes are on github. createState and createSignal are improvements over React's useState as it doesn't depend on the order of calls. Then import in components where its needed: There are two methods to update the writable value. Thus, there's no framework specific syntax to learn for state management, so no Angular $scope, no React this.state, and no Vue data.

Here we need to pass the current value as an argument. Look, I get it, popping that thing open can be intimidating, with its monospace font and that spooky "cd" to jump directories. Open source and radically transparent. Btw, maybe you would like to join us to Telegram channel: t.me/sveltejs. We can declare derived values using the computed function. I feel like React has reached a maturity level where there needs to be new syntactic sugar added (I'm looking at you, hooks!). I'm doing Maximilian's Svelte course, he puts script section at the top and it does look nice. You can find it on udemy.com.