If i want to call my `search` function after user ...

# coroutines

[khairil.ushan]

If i want to call my search function after user finish typing (by being idle for >=400ms). is this the correct way to do this with coroutines?

fun onKeywordChanged(keyword: String) {
  keywordJob.cancel()
  keywordJob = launch {
    delay(400)
    if (!isActive) return@launch
    search(keyword)
  }
}

[gildor]

Probably can be rewritten in a much more efficient way without creating additional coroutine on each tick

[acando86]

This looks like to me a good usecase for using csp channels and implement a debouncer on top of them

[gildor]

Yes, writing debounce operator on top of channel of events looks as most obvious solution, but even if you don’t want to use channels you still can write much more optimal version of this code

[khairil.ushan]

Sorry I'm a coroutines-noob. 🙂
would you share a little snippet to help me understand your point correctly?

[Daniel Tam]

as an aside, the if (!isActive) isn't necessary because delay() will resume with an exception if the coroutine is cancelled anyway

[Daniel Tam]

you can probably use withTimeout or the onTimeout clause with select to do something a bit nicer. E.g. withTimeout(400) { keywordChannel.receive() }

[Daniel Tam]

the logic is a bit more complex because you need to receive the first keystroke too but yeah..