Initial data commit

Task/Optional-parameters/Objective-C/optional-parameters.m

@@ -0,0 +1,25 @@
+typedef enum { kOrdNone, kOrdLex, kOrdByAddress, kOrdNumeric } SortOrder;
+
+@interface MyArray : NSObject {}
+// . . .
+@end
+
+@implementation MyArray
+
+- (void)sort {
+    [self sortWithOrdering:kOrdLex onColumn:0 reversed:NO];
+}
+
+- (void)sortWithOrdering:(SortOrder)ord {
+    [self sortWithOrdering:ord onColumn:0 reversed:NO];
+}
+
+- (void)sortWithOrdering:(SortOrder)ord onColumn:(int)col {
+    [self sortWithOrdering:ord onColumn:col reversed:NO];
+}
+
+- (void)sortWithOrdering:(SortOrder)ord onColumn:(int)col reversed:(BOOL)rev {
+    // . . . Actual sort goes here . . .
+}
+
+@end