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1 // Copyright 2013 Google Inc. All Rights Reserved. | |
2 // | |
3 // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 // you may not use this file except in compliance with the License. | |
5 // You may obtain a copy of the License at | |
6 // | |
7 // http://www.apache.org/licenses/LICENSE-2.0 | |
8 // | |
9 // Unless required by applicable law or agreed to in writing, software | |
10 // distributed under the License is distributed on an "AS IS" BASIS, | |
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 // See the License for the specific language governing permissions and | |
13 // limitations under the License. | |
14 | |
15 part of quiver.iterables; | |
16 | |
17 /// Returns an [Iterable] of [List]s where the nth element in the returned | |
18 /// iterable contains the nth element from every Iterable in [iterables]. The | |
19 /// returned Iterable is as long as the shortest Iterable in the argument. If | |
20 /// [iterables] is empty, it returns an empty list. | |
21 Iterable<List> zip(Iterable<Iterable> iterables) sync* { | |
22 if (iterables.isEmpty) return; | |
23 var iterators = iterables.map((i) => i.iterator).toList(growable: false); | |
24 while (true) { | |
25 var zipped = new List(iterators.length); | |
26 for (var i = 0; i < zipped.length; i++) { | |
27 if (!iterators[i].moveNext()) return; | |
28 zipped[i] = iterators[i].current; | |
29 } | |
30 yield zipped; | |
31 } | |
32 } | |
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