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User's Guide to the GNU Objective-C Class Library

12. Enumerating the Contents of a Collection

Enumeration methods allow you to perform a specified operation on the members of a collection. You can operate on all the members, operate on all the members until a flag is set, operate only on the members that pass some test, or operate on the results of passing the members through a modifying function. Each of the enumerators come in pairs: one method for enumerating in place, and another method that is "safe" for enumerating when the operation changes the contents of the receiving collection. If the contents of the collection are changed during the enumeration you must use the "safe" methods.

12.1 Safe vs Unsafe Enumerating

Enumerations while changing the contents

12.2 Basic Enumerating		Enumerations available for all collections
12.3 Keyed Enumerating		Enumerations on collections with keys
12.4 Indexed Enumerating		Enumerations on ordered collections

12.5 Defining Functions In Place with LAMBDA()

Defining functions in place with LAMBDA()