diff --git a/lib/model.dart b/lib/model.dart
index 8c111af..7a609b9 100644
--- a/lib/model.dart
+++ b/lib/model.dart
@@ -91,7 +91,7 @@
   }
 
   String toString() =>
-      '$tag [${Strings.join(content.mappedBy((e) => '$e'), ', ')}]';
+      '$tag [${Strings.join(content.map((e) => '$e'), ', ')}]';
 
   int get hashCode => super.hashCode ^ _hashCode(content);
 
@@ -150,7 +150,7 @@
       // TODO(nweiz): This could be faster if we used a RegExp to check for
       // special characters and short-circuited if they didn't exist.
 
-      var escapedValue = value.charCodes.mappedBy((c) {
+      var escapedValue = value.charCodes.map((c) {
         switch (c) {
         case _Parser.TAB: return "\\t";
         case _Parser.LF: return "\\n";
@@ -223,7 +223,7 @@
 
   String toString() {
     var strContent = content.keys
-        .mappedBy((k) => '${k}: ${content[k]}')
+        .map((k) => '${k}: ${content[k]}')
         .join(', ');
     return '$tag {$strContent}';
   }
diff --git a/lib/visitor.dart b/lib/visitor.dart
index b5c14c9..42dbb22 100644
--- a/lib/visitor.dart
+++ b/lib/visitor.dart
@@ -14,7 +14,7 @@
 
   /// Visits each node in [seq] and returns a list of the results.
   visitSequence(_SequenceNode seq)
-      => seq.content.mappedBy((e) => e.visit(this)).toList();
+      => seq.content.map((e) => e.visit(this)).toList();
 
   /// Visits each key and value in [map] and returns a map of the results.
   visitMapping(_MappingNode map) {
diff --git a/lib/yaml.dart b/lib/yaml.dart
index ef0ac83..e905e76 100644
--- a/lib/yaml.dart
+++ b/lib/yaml.dart
@@ -60,8 +60,8 @@
 /// are YamlMaps. These have a few small behavioral differences from the default
 /// Map implementation; for details, see the YamlMap class.
 List loadYamlStream(String yaml) {
-  return new _Parser(yaml).l_yamlStream().mappedBy((doc) =>
-      new _Constructor(new _Composer(doc).compose()).construct())
+  return new _Parser(yaml).l_yamlStream()
+      .map((doc) => new _Constructor(new _Composer(doc).compose()).construct())
       .toList();
 }
 
diff --git a/lib/yaml_map.dart b/lib/yaml_map.dart
index 65dd119..cbf18e5 100644
--- a/lib/yaml_map.dart
+++ b/lib/yaml_map.dart
@@ -29,7 +29,7 @@
   void clear() => _map.clear();
   void forEach(void f(key, value)) =>
     _map.forEach((k, v) => f(_unwrapKey(k), v));
-  Iterable get keys => _map.keys.mappedBy(_unwrapKey);
+  Iterable get keys => _map.keys.map(_unwrapKey);
   Iterable get values => _map.values;
   int get length => _map.length;
   bool get isEmpty => _map.isEmpty;