When comparing Riot vs Preact, the Slant community recommends Riot for most people. In the question“What are the best JavaScript libraries for building a UI?” Riot is ranked 5th while Preact is ranked 16th. The most important reason people chose Riot is:
Riot takes the expressions from a DOM tree and stores them in an array. Each of these expressions points to a DOM node. On each cycle these expressions are compared to the values in the DOM. So when a value has changed, Riot automatically updates the corresponding node. This way the operations are kept to a minimal amount and since the expressions can be cached, going through 1000 of them takes less than 1ms.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Minimal DOM operations
Riot takes the expressions from a DOM tree and stores them in an array. Each of these expressions points to a DOM node. On each cycle these expressions are compared to the values in the DOM. So when a value has changed, Riot automatically updates the corresponding node. This way the operations are kept to a minimal amount and since the expressions can be cached, going through 1000 of them takes less than 1ms.
Pro Lightweight
Riot is made to be used with websites of any kind, so it's built to be easy and lightweight, but still maintaining all the needed features for a UI library. It's only 2.5 KB in size when minified. So it can also be used for mobile web apps without requiring much bandwidth to download.
Pro Components use familiar HTML tags
Riot components use custom tags which are nothing more than familiar HTML tags coupled with JavaScript. This eliminates the need to learn another templating language or syntax. For example:
<todo>
<h3>TODO</h3>
<ul>
<li each={ item, i in items }>{ item }</li>
</ul>
<form onsubmit={ handleSubmit }>
<input>
<button>Add #{ items.length + 1 }</button>
</form>
this.items = []
handleSubmit(e) {
var input = e.target[0]
this.items.push(input.value)
input.value = ''
}
</todo>
Riot tries to separate HTML and JavaScript, while still keeping them inside the component. This way, the HTML can also be neatly mixed with JavaScript expressions.
Pro Supports server side rendering
Riot has support for server side rendering. The views and data are rendered on the server, then those views are sent as HTML to the browser when a user requests them.
This helps with initial loading time and is very useful for SEO purposes because the web app is indexed by search engines same as other static websites that have their HTML on the server.
Pro Easily pluggable with JS/HTML/CSS preprocessors
It is very easy to use your favorite preprocessors with the Riot compiler. Riot comes with CoffeeScript, ES6 (Babel), TypeScript, LiveScript and Jade support. You can also add your own parsers.
Pro Very simple
It makes React look confusing as hell. Nothing against React - It's just that easy to implement!
Pro Scoped CSS available in components
Riot supports scoped CSS inside components for every browser by rewriting stylesheet rules.
Pro Lives well with any other library, framework and usage pattern
Since it's not opinionated, even the scripting can be in anything that can be transpired to JavaScript.
Pro Separation of concerns with RiotControl
RiotControl is inspired by Facebook's Flux Architecture Pattern and it's a simple Central Event Controller/Dispatcher for Riot. It's extremely lightweight (like Riot itself) but unfortunately passes up on some features in favor of performance and simplicity.
RiotControl helps with storing the stater of the application, by passing events from views to stores and vice-versa. Stores can communicate with many views and views can do the same with many stores, this enables to clearly separate concerns and inter-component communication.
Pro Lightweight
The size when gzipped is only 3kb, and performance is as good as (or even faster than) React itself.
Pro Same API as react
Avoids having to learn an entire new paradigm, and makes it easy to switch between the two libraries later on.
Pro Lots of examples and libraries
They have a bunch of examples and addon libraries.
Pro Awesome CLI
Preact CLI gives you a perfect scoring PWA out-of-the-box with no configuration.
Cons
Con Difficult to learn
You need to be good in React JS first to learn Preact. Documentation is not rich. And some of the examples given on site are not working. Developers are not much active on Stack Overflow as well.