isEven, isOdd, isNegative, isMaxValue, isMinValue, isInfinite, isPositive, isSingleValue.

utils/pub/yaml/deep_equals.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.
 
 #library("deep_equals");
 
 /**
  * Returns whether two objects are structurally equivalent. This considers NaN
  * values to be equivalent. It also handles self-referential structures.
  */
@@ skipping 53 matching lines @@
   }
 
   return true;
 }
 
 /**
  * Returns whether two doubles are equivalent. This differs from `d1 == d2` in
  * that it considers NaN to be equal to itself.
  */
 bool _doubleEquals(double d1, double d2) {
-  if (d1.isNaN() && d2.isNaN()) return true;
+  if (d1.isNaN && d2.isNaN) return true;
   return d1 == d2;
 }