Deliver the first item as soon as it comes, debounce the following items

Question

This question is the same like this and this, but about Kotlin flow.

What needs to be achieved:

• Deliver the first item as soon as it comes
• Debounce all the following items the way debounce function works

Answer 1

There is simple solution with dynamic debounce timeout:

var firstEmission = true
flow.debounce {
    if (firstEmission) {
        firstEmission = false
        0L
    } else DEBOUNCE_TIMEOUT
}

Also possible to do this way:

merge(
    flow.take(1),
    flow.drop(1).debounce(DEBOUNCE_TIMEOUT)
)