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runtime/lib/immutable_map.dart

 // Copyright (c) 2012, 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.
 // Immutable map class for compiler generated map literals.
 
 class _ImmutableMap<K, V> implements Map<K, V> {
   final _ImmutableList _kvPairs;
 
   const _ImmutableMap._create(_ImmutableList keyValuePairs)
       : _kvPairs = keyValuePairs;
 
-
   V operator [](Object key) {
     // To preserve the key-value order of the map literal, the keys are
     // not sorted. Need to do linear search or implement an additional
     // lookup table.
     for (int i = 0; i < _kvPairs.length - 1; i += 2) {
       if (key == _kvPairs[i]) {
-        return _kvPairs[i+1];
+        return _kvPairs[i + 1];
       }
     }
     return null;
   }
 
   bool get isEmpty {
     return _kvPairs.length == 0;
   }
 
   bool get isNotEmpty => !isEmpty;
 
   int get length {
     return _kvPairs.length ~/ 2;
   }
 
   void forEach(void f(K key, V value)) {
     for (int i = 0; i < _kvPairs.length; i += 2) {
-      f(_kvPairs[i], _kvPairs[i+1]);
+      f(_kvPairs[i], _kvPairs[i + 1]);
     }
   }
 
   Iterable<K> get keys {
     return new _ImmutableMapKeyIterable<K>(this);
   }
 
   Iterable<V> get values {
     return new _ImmutableMapValueIterable<V>(this);
   }
@@ skipping 95 matching lines @@
       _current = _map._kvPairs[newIndex * 2 + 1];
       return true;
     }
     _current = null;
     _index = _map.length;
     return false;
   }
 
   E get current => _current;
 }