Simple Swift Debouncer

debounce.swift

func debounce( delay:NSTimeInterval, #queue:dispatch_queue_t, action: (()->()) ) -> ()->() {
	
	var lastFireTime:dispatch_time_t = 0
	let dispatchDelay = Int64(delay * Double(NSEC_PER_SEC))
	
	return {
		lastFireTime = dispatch_time(DISPATCH_TIME_NOW,0)
		dispatch_after(
			dispatch_time(
				DISPATCH_TIME_NOW,
				dispatchDelay
			),
			queue) {
				let now = dispatch_time(DISPATCH_TIME_NOW,0)
				let when = dispatch_time(lastFireTime, dispatchDelay)
				if now >= when {
					action()
				}
			}
	}
}

Solved it here: http://stackoverflow.com/questions/28411644/search-as-you-type-swift/28412321#28412321

do you have a sample implementation?