debounce function for golang
for my presentation tool slide-serve i used fsnotify to watch for changes to reload the browser. But for whatever reason, the events always came in doubled… so i tried to port the idea behind the underscore or RX debounce function to golang. This is the solution i came up with:
func debounce(interval time.Duration, input chan string, cb func(arg string)) {
var item string
timer := time.NewTimer(interval)
for {
select {
case item = <-input:
timer.Reset(interval)
case <-timer.C:
if item != "" {
cb(item)
}
}
}
}usage
in this example, the debounce time is one second, the input eventChanel is created to send events to debounce. The actual processing happens in the callback function.
eventChan := make(chan string)
go debounce(time.Second, eventChan, func(name string) {
// this function is only called once - with the last event
})
// ...
eventChan <- "send"
eventChan <- "a lot of"
eventChan <- "events"dont’t forget to start as a go-routine, otherwise you are stuck in the for loop ;)