Learning Concurrency in Kotlin

Writing a Fibonnaci iterator

The body of the iterator can be exactly the same as the one in the sequence:

val fibonacci = buildIterator {    yield(1L)    var current = 1L    var next = 1L    while (true) {        yield(next)        val tmpNext = current + next        current = next        next = tmpNext    }}

So now we can easily, and on demand, get up to 92 numbers in the sequence from this iterator:

for (i in 0..91) {    println("$i is ${fibonacci.next()}")}

If you are curious, these are the last few elements that can be calculated with this implementation: