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

lib/core/num.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.
 
 // Dart core library.
 
 /**
  * All numbers in dart are instances of [num].
  */
 abstract class num implements Comparable {
@@ skipping 31 matching lines @@
 
   /** Relational less than or equal operator. */
   bool operator <=(num other);
 
   /** Relational greater than operator. */
   bool operator >(num other);
 
   /** Relational greater than or equal operator. */
   bool operator >=(num other);
 
-  bool isNaN();
+  bool get isNaN;
 
-  bool isNegative();
+  bool get isNegative;
 
-  bool isInfinite();
+  bool get isInfinite;
 
   /** Returns the absolute value of this [num]. */
   num abs();
 
   /** Returns the greatest integer value no greater than this [num]. */
   num floor();
 
   /** Returns the least integer value that is no smaller than this [num]. */
   num ceil();
 
@@ skipping 46 matching lines @@
    *
    * The [num] in converted to an [int] using [toInt]. That [int] is
    * then converted to a string representation with the given
    * [radix]. In the string representation, lower-case letters are
    * used for digits above '9'.
    *
    * The [radix] argument must be an integer between 2 and 36.
    */
   String toRadixString(int radix);
 }