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Side by Side Diff: utils/template/utils.dart

Issue 11230011: Make hasNext a getter instead of a method. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Remove unused variable. Created 8 years, 2 months ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a 2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file. 3 // BSD-style license that can be found in the LICENSE file.
4 4
5 // Collection<T> supports most of the ES 5 Array methods, but it's missing 5 // Collection<T> supports most of the ES 5 Array methods, but it's missing
6 // map and reduce. 6 // map and reduce.
7 7
8 // TODO(jmesserly): we might want a version of this that return an iterable, 8 // TODO(jmesserly): we might want a version of this that return an iterable,
9 // however JS, Python and Ruby versions are all eager. 9 // however JS, Python and Ruby versions are all eager.
10 List map(Iterable source, mapper(source)) { 10 List map(Iterable source, mapper(source)) {
11 List result = new List(); 11 List result = new List();
12 if (source is List) { 12 if (source is List) {
13 List list = source; // TODO: shouldn't need this 13 List list = source; // TODO: shouldn't need this
14 result.length = list.length; 14 result.length = list.length;
15 for (int i = 0; i < list.length; i++) { 15 for (int i = 0; i < list.length; i++) {
16 result[i] = mapper(list[i]); 16 result[i] = mapper(list[i]);
17 } 17 }
18 } else { 18 } else {
19 for (final item in source) { 19 for (final item in source) {
20 result.add(mapper(item)); 20 result.add(mapper(item));
21 } 21 }
22 } 22 }
23 return result; 23 return result;
24 } 24 }
25 25
26 reduce(Iterable source, callback, [initialValue]) { 26 reduce(Iterable source, callback, [initialValue]) {
27 final i = source.iterator(); 27 final i = source.iterator();
28 28
29 var current = initialValue; 29 var current = initialValue;
30 if (current == null && i.hasNext()) { 30 if (current == null && i.hasNext) {
31 current = i.next(); 31 current = i.next();
32 } 32 }
33 while (i.hasNext()) { 33 while (i.hasNext) {
34 current = callback(current, i.next()); 34 current = callback(current, i.next());
35 } 35 }
36 return current; 36 return current;
37 } 37 }
38 38
39 List zip(Iterable left, Iterable right, mapper(left, right)) { 39 List zip(Iterable left, Iterable right, mapper(left, right)) {
40 List result = new List(); 40 List result = new List();
41 var x = left.iterator(); 41 var x = left.iterator();
42 var y = right.iterator(); 42 var y = right.iterator();
43 while (x.hasNext() && y.hasNext()) { 43 while (x.hasNext && y.hasNext) {
44 result.add(mapper(x.next(), y.next())); 44 result.add(mapper(x.next(), y.next()));
45 } 45 }
46 if (x.hasNext() || y.hasNext()) { 46 if (x.hasNext || y.hasNext) {
47 throw new ArgumentError(); 47 throw new ArgumentError();
48 } 48 }
49 return result; 49 return result;
50 } 50 }
51 51
52 52
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