Function create_memo 

pub fn create_memo<T>(f: impl Fn(Option<&T>) -> T + 'static) -> Memo<T>
where
    T: PartialEq + 'static,

👎Deprecated since 0.2.0: Use Memo::new instead; this will be removed in a future release

Create a Memo which takes the computed value of the given function, and triggers the reactive system when the computed value is different from the last computed value.