# Module React.S.Bool

    module Bool: sig .. end

    val zero : bool React.signal

    val one : bool React.signal

    val not : bool React.signal -> bool React.signal

    val (&&) : bool React.signal -> bool React.signal -> bool React.signal

    val (||) : bool React.signal -> bool React.signal -> bool React.signal

    val edge : bool React.signal -> bool React.event

`edge s` is `changes s`.

    val rise : bool React.signal -> unit React.event

`rise s` is `E.fmap (fun b -> if b then Some () else None) (edge s)`.

    val fall : bool React.signal -> unit React.event

`fall s` is `E.fmap (fun b -> if b then None else Some ()) (edge s)`.

    val flip : bool -> 'a React.event -> bool React.signal

`flip b e` is a signal whose boolean value flips each time `e` occurs. `b` is the initial signal value.

- [`flip b e`]0 `= not b` if [`e`]0 `= Some _`
- [`flip b e`]t `= b` if [`e`]<=t `= None`
- [`flip b e`]t `=` `not` [`flip b e`]t-dt if [`e`]t `= Some _`