1 files changed, 21 insertions, 0 deletions
diff --git a/lib/internal/v8.js b/lib/internal/v8.js
new file mode 100644
index 0000000000..b80e3de33d
--- /dev/null
+++ b/lib/internal/v8.js
@@ -0,0 +1,21 @@
+'use strict';
+
+function take(it, n) {
+  const result = [];
+  for (const e of it) {
+    if (--n < 0)
+      break;
+    result.push(e);
+  }
+  return result;
+}
+
+function previewMapIterator(it, n) {
+  return take(%MapIteratorClone(it), n);
+}
+
+function previewSetIterator(it, n) {
+  return take(%SetIteratorClone(it), n);
+}
+
+module.exports = { previewMapIterator, previewSetIterator };