April 2015
Intermediate to advanced
556 pages
17h 47m
English
book
Cocoa Programming for OS X: The Big Nerd Ranch Guide
by Aaron Hillegass, Adam Preble, Nate Chandler
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Challenge: Improve Error Handling
Add error handling to courseFromDictionary(_:)
(as discussed in the section called “Safely Working with Untyped Data Structures”
)
such that it returns nil if any of the fields or structure
are not as expected. Test the failure modes by changing the
key strings in the code.