How to create nested array or multidimensional array


How to create nested array or multidimensional array



I am trying to figure out how to do either nested arrays or multidimensional array for iPhone SDK programming using objective-c.

My data would be something like this, 3 columns and rows from 10 to 50.

name     department     year John     Sales          2008 Lisa     Sales          2009 Gina     Support        2007 

Any help is appreciated




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1:



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I'm not sure whether it's your example or your terminology, but that's not really a multi-dimensional array, that's an array of records.


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I'd make each of your records a class:.
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@interface Employee   NSString* name;   NSString* dept;   NSString* year; @end  @property (nonatomic,retain) NSString* name; @property (nonatomic,retain) NSString* dept; @property (nonatomic,retain) NSString* year;  // ... 


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rest of class def Employee* a = [[Employee alloc] init]; a.name = @"Bob"; a.dept = @"Sales"; a.year = @"2008"; // declare others NSArray* array = [NSArray arrayWithObjects:a,b,c,nil]; [a release];
This is more Objective C-ish than using a struct..
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If you really do mean a multi-dimensional array then there's nothing wrong with the "obvious" approach.


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Of course you might want to wrap it up in a class so you can also write some utility methods to make it easier to deal with..
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Could you perhaps make a structure like this:.
struct UserInfo {  string name;  string department;  int year; }  struct UserInfo users[3]; users[0].name = "John";  etc.... 

and make an array out of the structure so you wouldn't have to deal with multidimensional arrays? If not then just ignore me! :).


3:


Nesting arrays is the only really practical way to do a multidimensional array in Cocoa.

You could define a category on NSArray with methods like objectAtRow:column: to make accessing items more convenient.

Though in your case, I agree with Caleb that it doesn't look like you need this — your data looks like an array of objects..


4:


from @Stephen example...

You can do this to get first employee name..
Employee *e = (Employee *) [array objectAtIndex:0];  NSLog(@"Name: %@", e.name); 



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