Question

I am trying to find all objects inside an array of NSStrings that start with a specific string, and return a smaller array containing all of those objects. For example, you could have an array with the objects:

'Cat',
'Dog',
'Dolphin',
'Whale'

And when the string it searching is do, a new NSArray is returned with the Dog and Dolphin objects only.

Answer 1

NSString* beginsWithRequirement = @"do";
NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF BEGINSWITH[cd] %@", beginsWithRequirement];
NSArray* subArray = [originalArray filteredArrayUsingPredicate:predicate];

For more information on using predicates, see the Predicate Programming Guide.