??

server/rx/extensions.go

@@ -0,0 +1,47 @@
+package rx
+
+import "time"
+
+/*
+	Package rx contains:
+	-	Definitions for common reactive programming functions/patterns
+*/
+
+// ReactiveX inspired debounce function.
+//
+// Debounce emits a string from the source channel only after a particular
+// time span determined a Go Interval
+// --A--B--CD--EFG-------|>
+//
+//	-t->                 |>
+//	       -t->          |>   t is a timer tick
+//	             -t->    |>
+//
+// --A-----C-----G-------|>
+func Debounce(interval time.Duration, source chan string, cb func(emit string)) {
+	var item string
+	timer := time.NewTimer(interval)
+	for {
+		select {
+		case item = <-source:
+			timer.Reset(interval)
+		case <-timer.C:
+			if item != "" {
+				cb(item)
+			}
+		}
+	}
+}
+
+// ReactiveX inspired sample function.
+//
+// Debounce emits the most recently emitted value from the source
+// withing the timespan set by the span time.Duration
+func Sample[T any](span time.Duration, source chan T, cb func(emit T)) {
+	timer := time.NewTimer(span)
+	for {
+		<-timer.C
+		cb(<-source)
+		timer.Reset(span)
+	}
+}