Description based on print version record.

"Essential code and commands."

Includes index.

The objective-c philosophy -- An objective-c primer -- Memory management -- Common objective-c patterns -- Numbers -- Manipulating strings -- Working with collections -- Dates and times -- Working with property lists -- Interacting with the environment -- Key-value coding -- Handling errors -- Accessing directories and files -- Threads -- Blocks and grand central -- Notifications -- Network access -- debuggin objective-c -- The objective-c runtime.