how to combine two mutable arrays?

Question

I have an iPhone application in which i am trying to add two mutable arrays.

NSMutableArray *dataArray = [[NSMutableArray alloc] init];
NSMutableArray *dataArray1 = [[NSMutableArray alloc] init];
NSDictionary *news = [dict objectForKey:@"news"];
NSDictionary *deals = [dict objectForKey:@"deals"];
NSLog(@"%@", [news classForCoder]);
NSLog(@"%@", news);

for (NSDictionary *key in news)
{ 
    if ([key isKindOfClass:[NSDictionary class]])
    {
        [dataArray addObject:key];      
    }
}

for (NSDictionary *key in deals)
{
    if ([key isKindOfClass:[NSDictionary class]])
    {
        [dataArray1 addObject:key];        
    }
}

self.newssarray = dataArray;
[self.mTableView reloadData];

Here I want to add the two arrays 'dataArray' and 'dataArray2' to be combined into one array (self.newsarray). Can anybody help me in achieving this?

Chris Trahey · Accepted Answer · 2012-07-09 15:03:18Z

24

NSMutable array has all of NSArray's methods, including one for creating a new array by adding another array to itself:

self.newsarray = [[dataArray arrayByAddingObjectsFromArray:dataArray1] mutableCopy];

edited Jul 9, 2012 at 15:03

answered Jul 9, 2012 at 14:51

Chris Trahey

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7 Comments

hacker Over a year ago

thanks for the reply,But it is giving me a warning incompatable pointer types from nsmutable array to nsarray?

Chris Trahey Over a year ago

I assume you mean that the @property is expects to be mutable; answer modified.

Inder Kumar Rathore Over a year ago

self.newsarray = [[dataArray arrayByAddingObjectsFromArray:dataArray1] mutableCopy]; happy now....

Chris Trahey Over a year ago

Good call; SO has thought of everything ;-)

Mark Bridges Over a year ago

One thing to watch out for with this method is that if dataArray is nil you'll end up with the new array being nil even if dataArray1 isn't nil or empty.

|

Martin · Accepted Answer · 2012-07-09 15:15:50Z

4

If your property is NSMutableArray :

self.newsarray = [NSMutableArray arrayWithArray:[dataArray arrayByAddingObjectsFromArray:dataArray1]];

If it is NSArray :

self.newsarray = [dataArray arrayByAddingObjectsFromArray:dataArray1];

answered Jul 9, 2012 at 15:15

Martin

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Comments

Shakeel Ahmed · Accepted Answer · 2019-08-07 07:44:49Z

0

Swift 5 . Easy ans simple way

let arrayFind = NSMutableArray()
let arrayNotFind = NSMutableArray()

let arrPicOne = arrayFind as! [Any]
let arrPicTwo = arrayNotFind as! [Any]

let tempResult = arrPicOne + arrPicTwo

let arrResult = NSMutableArray(array: tempResult)

edited Aug 7, 2019 at 7:44

answered Aug 7, 2019 at 7:34

Shakeel Ahmed

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