How can I get all values for specific key from each NSDictionary in an NSArray? [duplicate]

Answer 1

There's a neat trick with key-value coding that does it:

NSArray *matches = [myArray valueForKey: @"Match"];

Here is an example in action:

NSArray *anArray = @[
                      @{@"aWord" : @"I"},
                      @{@"aWord" : @"have"},
                      @{@"aWord" : @"an"},
                      @{@"aWord" : @"array"},
                      @{@"aWord" : @"which"},
                      @{@"aWord" : @"contains"},
                      @{@"aWord" : @"dictionary"},
                      @{@"aWord" : @"objects."},
                      @{@"aWord" : @"Etc."},
                      ];

NSArray *aWordArray = [anArray valueForKey:@"aWord"];

After this last line, aWordArray will contain the words in the same order as in the original array of dictionaries.