Leptos, a cutting-edge full-stack Rust framework | Hacker News Reader

Leptos, a cutting-edge full-stack Rust framework

leptos.dev

68 pointsJadedBlueEyes13 comments

This looks very nice

Why use React style capitalized names for components, like App instead of app? It's a bummer when framework breaks a languages style conventions.

I'm confused by 'derived signals'. How is a derived signal different than a signal?

> Using a derived signal like this means that the calculation runs once per signal change per place we access double_count

https://leptos-rs.github.io/leptos/view/02_dynamic_attribute...

I think that the idea (before they add the memoization that the docs mention) is that this only serves as a way to name a computation, so you don't have to litter the same logic in multiple places but can instead just call the lambda instead

Edit to add:

> Why use React style capitalized names for components, like App instead of app? It's a bummer when framework breaks a languages style conventions.

I understand the remark, but on the other hand I also don't mind it; even like what they've done. I think it's useful as a signal that this this is component code, and has the added benefit that it looks familiar to other frontend code

> only serves as a way to name a computation

that is what a rust closure assigned to a variable does right. Why does a derived signal need a new name?

A derived signal is generally a closure. The word just reminds you that the signals have scope-based tracking so the framework knows when they have become invalid and need to run again

From this section https://leptos-rs.github.io/leptos/view/03_components.html#c...

> Using a component in the view looks a lot like using an HTML element. You’ll notice that you can easily tell the difference between an element and a component because components always have PascalCase names.

I'm currently reading up on Leptos and what looks like its major contender, Dioxus [1] in planning for next project. (acknowledging here that Yew [2] is maybe the OG Rust full stack / frontend framework, but I'm not considering it at this time)

Here's a nice comparison of the Rust frontend frameworks: https://github.com/flosse/rust-web-framework-comparison#fron...

Note that Leptos is interesting because it _does not use a virtual DOM_, unlike Yew and Dioxus which are React-like.

We already write our backend in Rust; why not use it for the whole stack and stop worrying about e.g. the Typescript object falling out of sync with the API struct?

[1] https://github.com/DioxusLabs/dioxus/ [2] https://yew.rs/

The author of Leptos has some great YouTube videos talking about Rust for the front-end, especially the performance aspect: https://youtube.com/@gbjxc

Is it just me, or is that page loading much quicker compared to others?

It seemed very fast to me

The funny thing is that I can't Ctrl+U on Firefox due to a character encoding error.

Anything new here from the other times this was posted earlier this year?

It's compared to Vue, React and Svelte on the homepage. So it's a frontend framework in Rust? Came as a surprise to me.

It has SSR too.

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