详解Kotlin：forEach也能break和continue

fun main(ags: Array<String>) {
 (0..100).forEach {
  if (50 <= it) return@forEach
  println(it)
 }
}

fun Pair<Int, Int>.forEach(block: (Int) -> Unit) {
 for (i in first..second) block.invoke(i)
}

Pair(1, 100).forEach(::println)

fun main(ags: Array<String>) {
 run outside@ {
  (0..20).forEach inside@ {
   if (10 <= it) return@outside
   println(it)
  }
 }
}

0
1
2
3
4
5
6
7
8
9
Process finished with exit code 0

run breaking@ {
 (0..20).forEach continuing@ {
  if (10 <= it) return@breaking
  println(it)
 }
}

run breaking@ {
 (0..20).forEach continuing@ {
  print(it)
  if (10 <= it) return@continuing
  println(it)
 }
}

00
11
22
33
44
55
66
77
88
99
1011121314151617181920
Process finished with exit code 0

public final class _5Kt
{
 public static final void main(@NotNull String[] args)
 {
  Intrinsics.checkParameterIsNotNull(args, "args");
  int $i$a$1$run;
  Iterable $receiver$iv = (Iterable)new IntRange(0, 20);
  int $i$f$forEach;
  for (Iterator localIterator = $receiver$iv.iterator(); localIterator.hasNext();)
  {
   int element$iv = ((IntIterator)localIterator).nextInt();int it = element$iv;
   int $i$a$1$forEach;
   System.out.print(it);
   if (10 <= it) {
    break;
   }
   System.out.println(it);
  }
 }
}