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What do you think about this implementation?

inline fun every(duration: Long, timeUnit: TimeUnit, whileCondition: () -> Boolean = { true }, function: () -> Unit) {
    while (whileCondition()) {
        function()
        Thread.sleep(timeUnit.toMillis(duration))
    }
}

This allows calling the following statement:

every(5, TimeUnit.SECONDS){
    println("Hello world")
}
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Usually it's a bad idea to put to sleep whole thread. I'd recommend use Java Timer or kotlin's wrapper for it.

Here is an example:

fixedRateTimer("default", false, 0L, 1000){
    println("Hello!")
    if (theEndIsNear) cancel()
}
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