Hailstone sequence: Difference between revisions

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@@ Line 6,009: / Line 6,009: @@
 <syntaxhighlight lang="kotlin">
 fun hailstone(start: Int) = generateSequence(start) { n ->
+    when {
-    if (n == 1) null else if (n % 2 == 0) n / 2 else n * 3 + 1
+        n == 1     -> null
+        n % 2 == 0 -> n / 2
+        else       -> n * 3 + 1
+    }
 }
@@ Line 6,015: / Line 6,019: @@
     val hail27 = hailstone(27).toList()
     println("The hailstone sequence for 27 has ${hail27.size} elements:\n$hail27")
-    val (n, length) = (1..100000).asSequence().map { it to hailstone(it).count() }.maxBy { it.second }
+    val (n, length) = (1..100000).asSequence()
+        .map { it to hailstone(it).count() }
+        .maxBy { it.second }
     println("The number between 1 and 100000 with the longest hailstone sequence is $n, of length $length")
 }