How to get the object count of every array present in another array?

Question

  NSMutableArray*array1=[NSMutableArray arrayWithObjects: @"1", @"2", @"3", nil];
  NSMutableArray*array2=[NSMutableArray arrayWithObjects: @"A", @"B", @"C",@"D", nil];
  NSMutableArray*array2=[NSMutableArray arrayWithObjects: @"AA", @"BB", @"CC", nil];

  NSMutableArray*MasterArray=[NSMutableArray arrayWithObjects: array1,array2,array3, nil];

How to get the object count of each array present in MasterArray?

You can create arrays more cleanly with modern Objective-C syntax: NSArray* array = @[@"1", @"2", @"3"]; This is called an array literal — Tim Reddy
– Tim Reddy, Commented Feb 8, 2014 at 3:26

KudoCC · Accepted Answer · 2014-02-08 03:27:59Z

3

If it isn't what you want, tell me.

[MasterArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    if ([obj isKindOfClass:[NSArray class]]) {
        NSLog(@"%lu", [obj count]) ;
    }
}] ;

edited Feb 8, 2014 at 3:27

answered Feb 8, 2014 at 3:22

KudoCC

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1 Comment

Danny Xu Over a year ago

I prefer this answer. But fast enumeration is much more faster then block-base API.

Tim Reddy · Accepted Answer · 2014-02-08 03:24:04Z

1

You can use fast enumeration...

for(NSArray* array in MasterArray) {
    NSLog(@"array:%@ count:%d", array, [array count]);
}

answered Feb 8, 2014 at 3:24

Tim Reddy

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Comments

Mick MacCallum · Accepted Answer · 2014-02-08 04:18:46Z

There are a few things I'd like to point out here. First of all, the code you've posted can be simplified dramatically using array literals.

NSMutableArray *array1 = [@[@"1",@"2",@"3"] mutableCopy];
NSMutableArray *array2 = [@[@"A",@"B",@"C",@"D"] mutableCopy];
NSMutableArray *array3 = [@[@"AA",@"BB",@"CC"] mutableCopy];

NSMutableArray *masterArray = [@[array1,array2,array3] mutableCopy];

Then theres the matter of your naming of MasterArray. In Objective-C, it's common to use lowerCamelCase formatting for instances, and UpperCamelCase for classes. Conforming to this style will help improve your code's readability.

Now, on to your actually problem. If you can get the count of an array just by accessing its count property, then there's no reason why you need a named variable specifically to access the array. Consider the following two implementations to access the count of the first sub array within an array. They both do the same thing:

NSArray *arr = @[subArray1,subArray2,subArray3];
NSArray *sub1 = arr[0];
NSUInteger countOfSub1 = sub1.count;

NSArray *arr = @[subArray1,subArray2,subArray3];
NSUInteger count = [arr[0] count];

So then if you want to get the count of every sub array in the master array, you can achieve the same thing inside a loop.

for(NSMutableArray *subArray in masterArray) {
    NSUInteger count = subArray.count;
}

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