Lykn

break and continue

Basic Usage

(for-of item items
  (if (= item :stop)
    (break))
  (if (= item :skip)
    (continue))
  (process item))

for (const item of items) {
  if (item === "stop") break;
  if (item === "skip") continue;
  process(item);
}

break exits the loop entirely. continue skips to the next iteration.

Labelled Breaks

For breaking out of nested loops, use label:

(label :outer
  (for-of row rows
    (for-of cell row
      (if (= cell target)
        (break :outer)))))

outer:
for (const row of rows) {
  for (const cell of row) {
    if (cell === target) break outer;
  }
}

The label :outer compiles to a JavaScript label. (break :outer) breaks out of the labelled statement, not just the inner loop. This is a kernel form used as-is — rare in practice, but indispensable when you need it.