Added full js & js_util packages

packages/quiver_iterables/lib/src/partition.dart

Index: packages/quiver_iterables/lib/src/partition.dart
diff --git a/packages/quiver_iterables/lib/src/partition.dart b/packages/quiver_iterables/lib/src/partition.dart
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+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+part of quiver.iterables;
+
+/// Partitions the input iterable into lists of the specified size.
+Iterable<List> partition(Iterable iterable, int size) {
+  if (size <= 0) throw new ArgumentError(size);
+  return _partition(iterable, size);
+}
+
+Iterable<List> _partition(Iterable iterable, int size) sync* {
+  if (iterable.isEmpty) return;
+  var iterator = iterable.iterator;
+  iterator.moveNext();
+  var first = iterator.current;
+  while (true) {
+    var part = [first];
+    for (var i = 0; i < size - 1; i++) {
+      if (!iterator.moveNext()) {
+        yield part;
+        return;
+      }
+      part.add(iterator.current);
+    }
+    yield part;
+    if (iterator.moveNext()) {
+      first = iterator.current;
+    } else {
+      return;
+    }
+  }
+}