learning-objective-c-a-ruby-analogy#3

gistfile1.m

//in the interface file
@interface NSArray (each)
-(void) each: (void (^)(id *))block;
@end
 
//in the implementation file
@implementation NSArray (each)
 
-(void) each: (void (^)(id *))block {
	for (id *object in self) {
		block(object);
	}
}
@end