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feat emitter: add flat_map

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Simon Cruanes 2025-12-04 21:11:22 -05:00
parent 8640db6a8c
commit a98a1aeb3f
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1 changed files with 12 additions and 2 deletions
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14
src/emitter/emitter.ml
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@ -33,11 +33,21 @@ let[@inline] closed self : bool = self.closed ()
let[@inline] flush_and_close (self : _ t) : unit = self.flush_and_close ()
(** [map f emitter] returns a new emitter that applies [f] to signals before
passing them to [emitter] *)
(** [map f emitter] returns a new emitter that applies [f] to signals item-wise
before passing them to [emitter] *)
let map (f : 'a -> 'b) (self : 'b t) : 'a t =
{ self with emit = (fun l -> self.emit (List.map f l)) }
(** [map_l f emitter] applies [f] to incoming lists of signals, and emits the
resulting list (if non empty) *)
let flat_map (f : 'a list -> 'b list) (self : 'b t) : 'a t =
let emit l =
match f l with
| [] -> ()
| fl -> self.emit fl
in
{ self with emit }
(** [tap f e] is like [e], but every signal is passed to [f] *)
let tap (f : 'a -> unit) (self : 'a t) : 'a t =
let emit l =