Adding a string to an Array in IOS

Question

I was wondering how to add a string to a mutable array without having to change the original array. So I'm thinking I have to make a copy of the array argument and then add the string to that.

    -(NSMutableArray *)arrayByAddingString:(NSString *)string toArray:(NSMutableArray *)array
     {
       NSArray *newArray = [NSMutableArray arrayWithArray:array];

       [newArray arrayByAddingObject:[string]];

return array;
}

I get the error Expected identifer, not sure what that means.

your newArray is NSArray. It should be NSMutableArray !! — Ketan Parmar
– Ketan Parmar, Commented Aug 2, 2016 at 5:09

Husein Behboudi Rad · Accepted Answer · 2016-08-02 04:45:25Z

2

Use addObject method:

[array addObject:@"HEllo"];

Where array is a NSMutableArray

In you example method, it will be like this:

 -(NSMutableArray *)arrayByAddingString:(NSString *)string toArray:(NSMutableArray *)array
   return [array addObject:string];

  }

answered Aug 2, 2016 at 4:45

Husein Behboudi Rad

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Comments

Shankar BS · Accepted Answer · 2016-08-02 04:47:47Z

1

u are creating the new array as just NSArray which is not mutable, and also the object u are trying to add is string why to use of [string], u can do like below,

 -(NSMutableArray *)arrayByAddingString:(NSString *)string toArray:(NSMutableArray *)array
  {
    NSMutableArray *newArray = [NSMutableArray arrayWithArray:array];
    [newArray addObject:string]; //no need of square brace, because string is an object 
    return newArray; //return the new array not the `array`
 }

answered Aug 2, 2016 at 4:47

Shankar BS

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1 Comment

Husein Behboudi Rad Over a year ago

it is not neccessary to reinitialize the array with arrayWithArray

Prashant Tukadiya · Accepted Answer · 2016-08-02 04:46:32Z

0

You just need to do is

 -(NSMutableArray *)arrayByAddingString:(NSString *)string toArray:(NSMutableArray *)array
   return [array addObject:string];

  }

answered Aug 2, 2016 at 4:46

Prashant Tukadiya

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Comments

Rohan · Accepted Answer · 2016-08-02 04:52:54Z

0

It should be like;

-(NSMutableArray *)arrayByAddingString:(NSString *)string toArray:(NSMutableArray *)array
    {
           [array addObject:string];

            return array;
    }

edited Aug 2, 2016 at 4:52

answered Aug 2, 2016 at 4:47

Rohan

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1 Comment

Husein Behboudi Rad Over a year ago

it is not neccessary to reinitialize the array with arrayWithArray .

pkc · Accepted Answer · 2016-08-02 05:16:44Z

0

There are extra [] in the code, change it to:

[newArray arrayByAddingObject:string];

edited Aug 2, 2016 at 5:16

pkc

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answered Aug 2, 2016 at 4:47

wershest

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1 Comment

Husein Behboudi Rad Over a year ago

arrayByAddingObject reinitialize the array and add the new item to that, while the question only wants to add the item to the current array and reinitializing this is not neccessary

Pratik Patel · Accepted Answer · 2016-08-02 07:31:58Z

0

You can use like this

In Swift

func arrayByAddingString(string: String, array: NSMutableArray) -> {
array.addObject(String)
return array
}

In Objective C

-(NSMutableArray *)arrayByAddingString:(NSString *)string toArray:(NSMutableArray *)array{
[array addObject:string];    
return array;
}

answered Aug 2, 2016 at 7:31

Pratik Patel

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