Pull all objects in NSMutableArray and spit it out into a NSString

Question

Hi i have a nsmutable array full of keywords and i wish to key each object and spit it out with a comma after each object example below. The NSMutable array is called KeywordArray

Array Structure

Keyword 1
Keyword 2
Keyword 3
Keyword 4 
Keyword 5
Keyword 6 
Keyword 7

I wish to convert that NSMutableArray into the following format within a NSString

Keyword 1, Keyword 2, Keyword 3, Keyword 4, Keyword 5, Keyword 6, Keyword 7

Thanks

Mason

Greg · Accepted Answer · 2011-03-25 15:04:54Z

5

You can use the componentsJoinedByString: method of NSArray to join the elements in the array using a separator. This will work with an NSMutableArray as well, because NSMutableArray inherits from NSArray.

NSMutableArray *array = ...;
NSString *string = [array componentsJoinedByString:@", "];

See the NSArray class reference for more information.

answered Mar 25, 2011 at 15:04

Greg

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Community · Accepted Answer · 2017-05-23 10:33:10Z

3

You can do it easily:

NSMutableArray *testArray = [[NSMutableArray alloc] initWithObjects:@"keyword1", @"keyword2" @"keyword3", nil];
NSString *string = [testArray componentsJoinedByString:@","];

Same case, but with NSArray was discussed here

edited May 23, 2017 at 10:33

CommunityBot

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answered Mar 25, 2011 at 15:10

ppolak

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unexpectedvalue · Accepted Answer · 2011-03-25 15:05:32Z

2

NSArray *arr;
[arr componentsJoinedByString:@", "];

answered Mar 25, 2011 at 15:05

unexpectedvalue

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2 Comments

unexpectedvalue Over a year ago

Doesn't matter, componentsJoinedByString: works for NSMutableArray and NSArray. Returns a NSString.

GendoIkari Over a year ago

It doesn't matter that it's a mutable array, because NSMutableArray is a subclass of NSArray. Therefore it has access to all methods that NSArray has.

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