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gbj avatar gbj commented on June 6, 2024

What does component() do?

Calls your function inside component_scope

pub fn component<G>(f: impl FnOnce() -> View<G>) -> View<G>
where
G: GenericNode,
{
component_scope(f)
}

What does component_scope() do?

pub fn component_scope<G: GenericNode>(f: impl FnOnce() -> View<G>) -> View<G> {
if G::USE_HYDRATION_CONTEXT {
#[cfg(feature = "hydrate")]
return crate::hydrate::hydrate_component(|| untrack(f));
#[cfg(not(feature = "hydrate"))]
return untrack(f);
} else {
untrack(f)
}
}

Calls your component within untrack().

Why does it do this? This prevents a signal read inside your component body from subscribing itself to an effect outside your component body, which would cause the entire component to rerender every time that signal changed.

This is very common in fine-grained reactive libraries. Much like not wearing a seat belt, omitting component(|| ...) won't cause you any issues until it does, and then you'll wish you'd just always done it.

from sycamore.

dessalines avatar dessalines commented on June 6, 2024

Gotcha, thanks!

BTW I've decided to use the builder version for projects, in order to take advantage of cargo fmt, and more linting.

Except for one page, the docs only show the view! macro version, so I'm having to guess and find things manually.

Should I open up an issue for that one?

from sycamore.

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