Function leptos_core::map_keyed

pub fn map_keyed<T, U, K>(
    cx: Scope,
    list: impl Fn() -> Vec<T> + 'static,
    map_fn: impl Fn(Scope, &T) -> U + 'static,
    key_fn: impl Fn(&T) -> K + 'static
) -> Memo<Vec<U>>where
    T: PartialEq + Debug + 'static,
    K: Eq + Hash,
    U: PartialEq + Debug + Clone + 'static,

Function that maps a Vec to another Vec via a map function. The mapped Vec is lazy computed; its value will only be updated when requested. Modifications to the input Vec are diffed using keys to prevent recomputing values that have not changed.

This function is the underlying utility behind Keyed.

Params

• list - The list to be mapped. It is obtained via an accessor function, so can be a ReadSignal, a Memo or a derived signal.
• map_fn - A closure that maps from the input type to the output type.
• key_fn - A closure that returns an unique key to each entry.

Credits: Based on implementation for Sycamore, which is in turned based on on the TypeScript implementation in https://github.com/solidjs/solid