Create an array for an each object present in an array using for loop in objective c

Question

I been searching for this but failed to find a proper solution. Is it possible to create an array for each object present in an array?Lets say I have an array 'fruits'

   NSMutableArray *fruits=[[NSMutableArray alloc]init];
   [fruits addObject:@"apple"];
   [fruits addObject:@"banana"];
   [fruits addObject:@"mango"];

Now there are three objects in my array. IS it possible to create an array for each of the object present in the array 'fruit'.

Can I do something like

   for(int i=0;i<fruits.count;i++){
    NSMutableArray *fruits_%d=[[NSMutableArray alloc]init];
    }

I know it is a blunder. Is there any way I can do that?

Thanks in advance.

What do you want to do with these arrays? Most likely you want to create an array of these new arrays. — rmaddy
– rmaddy, Commented Oct 4, 2014 at 21:39
It sounds like you may be looking for a NSDictionary - you could store arrays with the fruit names as the keys — Paulw11
– Paulw11, Commented Oct 4, 2014 at 21:41
Lets say, I have an array called account and then I would like to store all the details of those accounts in another array created. @rmaddy — Teja Nandamuri
– Teja Nandamuri, Commented Oct 4, 2014 at 21:45
(But you can't do this: NSMutableArray *fruits_%d=[[NSMutableArray alloc]init];. If you want multiple fruits arrays, make it an array of arrays.) — Hot Licks
– Hot Licks, Commented Oct 4, 2014 at 21:47
I know it is a blunder. I used that just to give a clear understanding about my question. @HotLicks — Teja Nandamuri
– Teja Nandamuri, Commented Oct 4, 2014 at 21:54

Undo · Accepted Answer · 2014-10-04 21:41:01Z

2

You could use a dictionary instead:

NSMutableDictionary *fruitDict=[[NSMutableDictionary alloc]init];
[fruitDict setObject:[[NSMutableArray alloc]init] forKey:@"apple"];
[fruitDict setObject:[[NSMutableArray alloc]init] forKey:@"banana"];
[fruitDict setObject:[[NSMutableArray alloc]init] forKey:@"mango"];

Or a little cleaner syntax:

NSMutableArray *fruits=[[NSMutableArray alloc]init];
[fruits addObject:@"apple"];
[fruits addObject:@"banana"];
[fruits addObject:@"mango"];

NSMutableDictionary *fruitDict = [[NSMutableDictionary alloc] init];

for (NSString *fruit in fruits)
{
    [fruitDict setObject:[[NSMutableArray alloc]init] forKey:fruit];
}

Then when you want to retrieve the array:

NSMutableArray *myArray = fruitDict[@"banana"]

The above code will yield the array for the banana item.

answered Oct 4, 2014 at 21:41

Undo♦

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3 Comments

Teja Nandamuri Over a year ago

Instead of forKey:@"apple", Can I use forKey:[fruits objectatindex:0]; ?

Undo Over a year ago

@T_77 No, that would create a dictionary with only one key, @"apple". You could use your for(int i=0;i<fruits.count;i++) and forKey:[fruits objectAtIndex:i] though.

Teja Nandamuri Over a year ago

ya...thats what I am thinking. Let me check!!

Gustavo Barbosa · Accepted Answer · 2014-10-04 21:45:15Z

1

I don't know what exactly you want but maybe you can do something like this:

NSMutableArray *fruits = [[NSMutableArray alloc] init];
[fruits addObject:@"apple"];
[fruits addObject:@"banana"];
[fruits addObject:@"mango"]; 

NSMutableArray *arrayOfFruits = [[NSMutableArray alloc] initWithCapacity:fruits.count];
for (int i = 0; i < fruits.count; i++) {
    [arrayOfFruits addObject:@[fruits[i]]];
}

answered Oct 4, 2014 at 21:45

Gustavo Barbosa

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