package react
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val none : 'a option signalnone is S.const None.
some s is S.map ~eq (fun v -> Some v) None, where eq uses s's equality function to test the Some v's equalities.
val value :
?eq:('a -> 'a -> bool) ->
default:[ `Init of 'a signal | `Always of 'a signal ] ->
'a option signal ->
'a signalvalue default s is s with only its Some v values. Whenever s is None, if default is `Always dv then the current value of dv is used instead. If default is `Init dv the current value of dv is only used if there's no value at creation time, otherwise the last Some v value of s is used.
- [
value ~default s]t= vif [s]t= Some v - [
value ~default:(`Always d) s]t=[d]t if [s]t= None - [
value ~default:(`Init d) s]0=[d]0 if [s]0= None - [
value ~default:(`Init d) s]t=[value ~default:(`Init d) s]t' if [s]t= Noneand t' is the greatest t' < t with [s]t'<> Noneor 0 if there is no sucht'.