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val allowedUsers = users.filter { it.age > MINIMUM_AGE }

val isOfAllowedAge = { user: User -> user.age > MINIMUM_AGE } val allowedUsers = users.filter(isOfAllowedAge)

General-purpose stopwatch for timing how long a function takes to run: object Benchmark { fun realtime(body: () -> Unit): Duration { val start = Instant.now() try { body() } finally { val end = Instant.now() return Duration.b...