Added method map to Collection interface and all its implementations (except classes generated fr...

frog/utils.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Collection<T> supports most of the ES 5 Array methods, but it's missing
 // map and reduce.
 
 // TODO(jmesserly): we might want a version of this that return an iterable,
 // however JS, Python and Ruby versions are all eager.
 List map(Iterable source, mapper(source)) {
@@ skipping 104 matching lines @@
  * A [FixedCollection] is a collection of [length] items all of which have the
  * identical [value]
  */
 class FixedCollection<E> implements Collection<E> {
   final E value;
   final int length;
   const FixedCollection(this.value, this.length);
 
   Iterator<E> iterator() => new FixedIterator<E>(value, length);
   void forEach(void f(E element)) { Collections.forEach(this, f); }
+  Collection map(f(E element)) {

[sra1, 2012/01/05 22:46:49]

nit: prefer =>, especially if it fits on one line.

+    return Collections.map(this, new List(), f);
+  }
   Collection<E> filter(bool f(E element)) {
     return Collections.filter(this, new List<E>(), f);
   }
   bool every(bool f(E element)) => Collections.every(this, f);
   bool some(bool f(E element)) => Collections.some(this, f);
   bool isEmpty() => length == 0;
 }
 
 class FixedIterator<E> implements Iterator<E> {
   final E value;
   final int length;
   int _index = 0;
   FixedIterator(this.value, this.length);
 
   bool hasNext() => _index < length;
   E next() {
     _index++;
     return value;
   }
 }
 
 // Color constants used for generating messages.
 String _GREEN_COLOR = '\u001b[32m';
 String _RED_COLOR = '\u001b[31m';
 String _MAGENTA_COLOR = '\u001b[35m';
 String _NO_COLOR = '\u001b[0m';