Merge NSMutableArray element in the same array by string

Question

I would like a group element in NSMutableArray like this question: How to implement "group by values" in NSMutableArray?

But, my problem is inside the NSMutableArray i have no values but I have an object of a class model like:

@interface up : NSObject 

@property (nonatomic,strong) NSString *id;
@property (nonatomic,strong) NSString *name;

@end

Any ideas?

Example:

Well, practically I have an NSMutableArray and in every cell of this array I have an object of a class model. What I have to do is create a new data structure where I merge objects based on the ID. For example:

{
 id = 1;
 name = "test"; 

}
{
 id = 1;
 name = "test1"; 
}
{
 id = 2;
 name = "test2";
}
{
 id = 2; 
 name = "test3"; 
}
{
 id = 3;
 name = "test4"; 
}

Result:

    {
 id = 1;
 name = "test"; 
 name = "test1"; 
}
{
 id = 2;
 name = "test2";
 name = "test3"; 

}
{
 id = 3;
 name = "test4"; 
}

generating your expected result is not possible; what kinda output you'd like to get eventually? — holex
– holex, Commented Oct 13, 2017 at 8:06

Noot · Accepted Answer · 2017-10-13 02:33:31Z

0

    NSMutableDictionary<NSString *, NSMutableArray<NSString *> *> *newDict =  NSMutableDictionary.new;
    for( UP *up in data) {
        if (!newDict[up.id]) {
            newDict[up.id] = NSMutableArray.new;
        }
        [newDict[up.id] addObject:up.name];
    }

newDict is the new data structure.

edited Oct 13, 2017 at 2:33

answered Oct 13, 2017 at 0:47

Noot

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1 Comment

Luca tom Over a year ago

Oh my god. Work perfectly! Thank you!

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