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3 reasons you should try Svelte

Ameen on September 26, 2020

Svelte a new contender to the war of JavaScript frameworks. It might not be as mature as other frameworks like React and Vue, but here are...

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Peter Vivo • Sep 26 '20 • Edited

react with hook is 9 line, but this component can be instanced any amount, and after remove closeInterval properly. Maybe seems complex, but you can use modern vanilla JS / JSX.

import React, {useState, useEffect} from 'react';
export const Timer = ({...props}) => {
  const [seconds, setSeconds] = useState(0);
  useEffect(_=>{
    const interval = setInterval( _ => setSeconds( s => s + 1 ), 1000);
    return _ => clearInterval(interval); // refacted: Franciszek Krasnowski 
  }, []);
  return <div {...props}>{seconds}</div>;
}

implement example

import React from 'react';
import {Timer} from './timer.js';
import './style.css';

export default () => (
  <section>
    <Timer />
    <Timer style={{color: 'red'}} />
    <Timer className="custom-timer" />
  </section>
);

each timer have own state

Franciszek Krasnowski • Sep 26 '20

React is still terse. But what iscloseInterval? Did you mean clearInterval? And I prefer using custom hooks to encapsulate ”reference fragile” behavior. For example by making useInterval hook or utilize the one from rooks package

Peter Vivo • Sep 26 '20

you right, clearInterval of course!

Mike • Sep 26 '20

I used React for the first few years right after it was announced and absolutely loved it. For the past year and a half, I've used Svelte exclusively and wouldn't go back. Here's a lot more detail on why: mikenikles.com/blog/why-i-moved-fr...

As for your example with hooks: In my opinion, this is near impossible to understand without a deep knowledge of React which likely takes many hours of reading and using to acquire.

The Svelte example on the other hand is self-explanatory. With an hour of effort to work through the interactive Svelte tutorial, most people are ready to be productive.

If team efficiency, developer experience, time to market, maintainability and end user performance experience are important measures, I'd highly recommend Svelte over React in most cases.

It's important to note, and the author mentioned that too, that Svelte is less established. Fewer jobs, fewer opportunities to use it on a day job etc. However, that's the case for any new framework. Svelte is adopted quickly among big companies such as Apple and Spotify.

Alex Khismatulin • Sep 26 '20 • Edited

Good points, thanks!
But #3 contains a common mistake when describing svelte – its difference is that it compiles to imperative JS, not vanilla. All top frameworks compile to vanilla JS

Alex Kh

@alexkhismatulin

I’m hearing a lot that @sveltejs compiles your components into *vanilla* js compared to @reactjs or @vuejs but that’s a confusion. They all have a vanilla output and what people confuse is *imperative* code output in svelte vs *declarative* in react and vue

09:09 AM - 26 Sep 2020

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Juan F Gonzalez • Sep 26 '20

Yes, agree with the headline of this article, you should try Svelte and not just because is the new "cool kid on the block".

For me, it was a breath of fresh air to be able to make websites with as little extra things possible and still have several functionalities baked into the app.

I personally like how you can have everything necessary for a component in a single file and not needing to go back and forth between styles, markup and js.

I have already used it 2 times to make business type websites for my father and a good friend of mine and it almost feels like I was just using plan HTML + CSS plus some cool functionalities you can implement with just few lines of JS.

chris-czopp • Sep 26 '20

I'm not a big React fanboy but, I'm not sure about Svelte. Blending styles, controllers and presentation into one file feels wrong. Also, I don't know if in Svelte it's possible (or how hard it would be) to implement an app state management with central store(s). I think the comparison would be only fair in a more advanced use case.

Junxiao Shi • Sep 26 '20

Svelte allows you to declare store in a file, and import them into components. If the value of a store changes, all components importing this store are notified and updated.

chris-czopp • Sep 26 '20

cool, that's what I would expect :)

Zen • Sep 26 '20

svelte.dev/tutorial/writable-stores

Maciek Grzybek • Sep 26 '20

Most of my career I've been using React, but recently I decided to try Svelte for a project. I think I still prefer React approach to building UI. But that's my personal opinion. But one thug bothers me in that article, why are co comparing Svelte to React example that uses classes? It's quite 'old' approach and you can do everything with hooks much easier and cleaner. I just think these kind of comparisons don't give a real justice.

Juan Carlos • Sep 26 '20

I tried react and vue and dont like it.
I think that Svelte and Nim are better giving you more features without the need of linking other additional libraries.
You should try Nim if you liked Svelte.
😃

Jon Randy 🎖️ • Sep 27 '20

Or you could try RiotJS which appears to have heavily influenced Svelte, and is a lot more mature - it's on version 4 (version 5 is in alpha)and has been around since 2013. A similar timer component would be defined as follows:

<timer>
  <p>Seconds Elapsed: { state.time }</p>

  <script>
    export default {
      tick() {
        this.update({ time: ++this.state.time })
      },
      onBeforeMount(props) {
        // create the component initial state
        this.state = {
          time: props.start
        }

        this.timer = setInterval(this.tick, 1000)
      },
      onUnmounted() {
        clearInterval(this.timer)
      }
    }
  </script>
</timer>

Zen • Sep 26 '20

I only know base of HTML, CSS, and JS (plus, little knowledge about Vue). Then, I try React but it's difficult for me. I try Svelte, then, I can create website with it. It's so easy! 🥳🥳🥳

I build my blog with Svelte.

shadowtime2000 • Sep 26 '20

imo it is just even easier to write functional react components for stuff like that so you may want to consider that when comparing line count

Alfredo Salzillo • Sep 26 '20

Also, the div is missing in the svelte version, anche the timeout Is never cleared. So it's not the same example.

Alex Khismatulin • Sep 27 '20

The word vanilla is confusing here IMO

Junxiao Shi • Sep 26 '20

The major drawback of Svelte is the lack of TypeScript type checking in components. I tried it once and this problem is bothering me.

Mike • Sep 26 '20

Is that still an issue even now that official TypeScript support is available? svelte.dev/blog/svelte-and-typescript

Junxiao Shi • Sep 26 '20

Beautiful!

Mike • Sep 26 '20

Hehe, I agree. It's been a feature request for a long time and is now available ☺️. I haven't had a chance to introduce TypeScript to my project yet, but it's high up on the wishlist.