Changes between Version 2 and Version 3 of TypeExtensions

Timestamp:

07/29/13 12:13:27 (11 years ago)

Author:

hopscc

Comment:

--

TypeExtensions

@@ -1 +1 @@
 == Type Extensions ==
 
-Woops. Not documented yet. Real quick:
+Extend an existing type with additional method(s).
+
+ 
+== Grammar ==
+{{{
+extend EXISTINGTYPE
+   def ADDMETHOD
+       ...
+   ....
+}}}
+
+== Example ==
+
 {{{
 #!cobra
@@ -8 +20 @@
     def doubleLength as int
         return .length * 2
+
+    def capitalized as String
+        """
+        Returns the string with the first character capitalized.
+        Returns a blank string for a blank string.
+        """
+        ensure
+                result.length == .length
+                result.length implies result[0] == result[0].toUpper
+        test
+                assert 'chuck'.capitalized == 'Chuck'
+                assert 'Chuck'.capitalized == 'Chuck'
+                assert ''.capitalized == ''
+                assert ' foo'.capitalized == ' foo'
+                assert 'f'.capitalized == 'F'
+                assert '1aoeu'.capitalized == '1aoeu'
+        body
+                if .length == 0, return this
+                return this[:1].toUpper + this[1:]
 }}}
 
+== Restrictions ==
+You can use extension methods to extend a class or interface, but cannot override existing matching methods.
+
+
 See also: StandardLibraryExtensionMethods, LanguageTopics