Based on lodash _.throttle.

Use case: I want to publish an update to a websocket at most any given time.Duration. So basically like the already existing debounce, but limiting with delay, not delaying until end.

Working with onboard functions, I came up with something like this:

delay := 500 * time.Millisecond

internalInvoke, cancel = lo.NewDebounceBy(delay, func(key int64, count int) {
    // .... do stuff
})

throttle = func() {
    internalInvoke(time.Now().Round(delay).UnixNano())
}

So in the end, calling throttle() will put the rounded nano time in a bucket for debounce and that bucket will be triggered after delay is no longer inside the same rounding range.

Not sure what to do with cancel though.