Function create_selector

pub fn create_selector<T>(f: impl FnMut() -> T + 'static) -> ReadSignal<T>
where
    T: PartialEq,

Creates a memoized value from some signals.

Unlike create_memo, this function will not notify dependents of a hange if the output is the same. That is why the output of the function must implement PartialEq.

To specify a custom comparison function, use create_selector_with.

Example

let state = create_signal(1);
let squared = create_selector(move || state.get() * state.get());
assert_eq!(squared.get(), 1);

create_effect(move || println!("x^2 = {}", squared.get()));

state.set(2); // Triggers the effect.
assert_eq!(squared.get(), 4);

state.set(-2); // Does not trigger the effect.
assert_eq!(squared.get(), 4);