Compare the objects of NSMutablearray with For loop values

Question

I have the NSMutableArray with following values:

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5", nil];

This is my For loop:

for(int i=0; i<30; i++)
{
    //here I want to compare each object from above array with value of i from for loop. and add the further output. e.g.
    if(i== object from array)
    {
          //do this
    }
}

Actually I have just five objects or values in array so how can I compare each value of i with each object or values of NSMutableArray.

rckoenes · Accepted Answer · 2012-05-31 08:43:33Z

3

So if I understand you correctly you want to compare each object in the array with all other objects in the Array? Here is example, not test and might need some optimalisation.

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5", nil];

for(NSInteger i = 0; i < [array count]; i++) {
    for(NSInteger j = 0; j < [array count]; j++) {
        if ( i == j) {
           // No need to check if its the same object.
           continue;
        }

        NSString *stringI = [array objectAtIndex:i];
        NSString *stringJ = [array objectAtIndex:j];

        if ([stringI isEqualToString:stringJ) {
           // Do something.
        } 
    }
}

answered May 31, 2012 at 8:43

rckoenes

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Comments

Guntis Treulands · Accepted Answer · 2012-05-31 08:47:22Z

2

If you trust IOS functions containsObject and indexOfObject, then:

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5", nil];

for(int i = 0; i< 30; i++)
{
    if([array containsObject:[NSString stringWithFormat:@"%i",i]])
    {
        //array contains  "i" item,  
        //and we can know it's location this way:
        int foundArrayItemId = [array indexOfObject:[NSString stringWithFormat:@"%i",i]];
    }
}

answered May 31, 2012 at 8:47

Guntis Treulands

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6 Comments

rckoenes Over a year ago

Great solution, but this will only work with simple object like, string and numbers. Not with more complex object.

Guntis Treulands Over a year ago

Can You provide an example of more complex object? I'm using this method in my own project to check in array and find location of NSIndexPath objects, various string and float values.

rckoenes Over a year ago

Wel complex object could be object you created your self. Like a class that extents NSObject with custom properties. The contains object method will call the isEqual: method on the objects in the array: developer.apple.com/library/ios/#documentation/Cocoa/Reference/…:

Guntis Treulands Over a year ago

Fair enough - then my example would fail. But anyways - I believe we should use simple methods for simple things, and more complex, for complex ones.

rckoenes Over a year ago

Totally agree, never make you code more complex and it needs to be.

|

The iOSDev · Accepted Answer · 2012-05-31 08:45:42Z

1

just use nested loop for comparison like

for(i = 0; i <= [array count];i++)
    {
        for(j=0; j<=[mutableArrya count]; j++)
            {
                 //Do comparison
            }
    }

i think this will help you

Happy Coding :) enjoy it :)

answered May 31, 2012 at 8:45

The iOSDev

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Comments

Ishu · Accepted Answer · 2012-05-31 08:50:46Z

0

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5", nil];

for(int i=0;i<30;i++)

    {
      NSString str= [NSString stringWithFormat:@"%i",i];
        if([array containsObject:str])
        {
          //do this
        }
    }

answered May 31, 2012 at 8:50

Ishu

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Comments

Jay Patel · Accepted Answer · 2012-05-31 09:17:21Z

0

Write this code :

NSMutableArray *arrCount = [[NSMutableArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14",@"15",@"16",@"17",@"18",@"19",@"20",@"21",@"22",@"23",@"24",@"25",@"26",@"27",@"28",@"29",@"30", nil];
NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:@"21",@"12",@"23",@"14",@"25", nil];

    for (NSString *strComapre in array)
    {
        NSLog(@"%@",strComapre);
        if ([arrCount containsObject:strComapre]) 
        {
             NSLog(@"Compare");
        }
        else
        {
             NSLog(@"Not Compare");
        }
    }

answered May 31, 2012 at 9:17

Jay Patel

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Comments

RPM · Accepted Answer · 2012-10-16 18:19:35Z

0

There is an isEqualToArray method in NSArray. Can you not use that as follows:

[array1 isEqualToArray:array2]

answered Oct 16, 2012 at 18:19

RPM

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