Split array of dictionaries into sub-arrays - ios

Question

Below is a part of my JSON response where 'results' is an array of dictionaries :
{
"results": [
{
"id": 6,
"genre_name": "Action",
"cover_image": "http://54.254.204.81/images/Action.png"
},
{
"id": 5,
"genre_name": "Adventure",
"cover_image": "http://54.254.204.81/images/Adventure.png"
},
{
"id": 4,
"genre_name": "Romance",
"cover_image": "http://54.254.204.81/images/Romance.png"
},
{
"id": 3,
"genre_name": "Sci-Fci",
"cover_image": "http://54.254.204.81/images/Sci-Fi.png"
},
{
"id": 1,
"genre_name": "Guide",
"cover_image": "http://54.254.204.81/images/Adventure_XHLbNfN.png"
},
{
"id": 2,
"genre_name": "Horror",
"cover_image": "http://54.254.204.81/images/Phineas-and-Ferb-Christmas-Wallpaper.jpg"
},
{
"id": 7,
"genre_name": "Emotional",
"cover_image": "http://54.254.204.81/images/a0fea991287cf41b6b9c4aa16196517f.jpg"
},
{
"id": 8,
"genre_name": "abcd",
"cover_image": "http://54.254.204.81/images/logo_text_S0KyzUW.png"
}
]
}
Now I have another JSON response where 'genres' is an array which contains objects which are subset of 'results' array objects with key 'id'.
{
"genres": [
3,
1
]
}
Now, is it possible for me to split 'results' into two arrays 'results1' and 'results2' like:
{
"results1": [
{
"id": 6,
"genre_name": "Action",
"cover_image": "http://54.254.204.81/images/Action.png"
},
{
"id": 5,
"genre_name": "Adventure",
"cover_image": "http://54.254.204.81/images/Adventure.png"
},
{
"id": 4,
"genre_name": "Romance",
"cover_image": "http://54.254.204.81/images/Romance.png"
},
{
"id": 2,
"genre_name": "Horror",
"cover_image": "http://54.254.204.81/images/Phineas-and-Ferb-Christmas-Wallpaper.jpg"
},
{
"id": 7,
"genre_name": "Emotional",
"cover_image": "http://54.254.204.81/images/a0fea991287cf41b6b9c4aa16196517f.jpg"
},
{
"id": 8,
"genre_name": "abcd",
"cover_image": "http://54.254.204.81/images/logo_text_S0KyzUW.png"
}
]
}
and
{
"results2": [
{
"id": 3,
"genre_name": "Sci-Fci",
"cover_image": "http://54.254.204.81/images/Sci-Fi.png"
},
{
"id": 1,
"genre_name": "Guide",
"cover_image": "http://54.254.204.81/images/Adventure_XHLbNfN.png"
}
]
}

Answer 1

For that you need to use NSPredicate with IN and NOT like this way.
First create resultArray and genresArray from your two JSON responses.
NSArray *resultArray = [firstJSONResponse objectForKey:#"results"];
NSArray *genresArray = [secondJSONResponse objectForKey:#"genres"];
Now filter your resultArray using NSPredicate to get your result.
For Result1
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"NOT (id IN %#)",genresArray];
NSArray *firstSplitArray = [resultArray filteredArrayUsingPredicate:predicate];
NSLog(#"%#",firstSplitArray);
For Result2
predicate = [NSPredicate predicateWithFormat:#"id IN %#",genresArray];
NSArray *secondSplitArray = [resultArray filteredArrayUsingPredicate:predicate];
NSLog(#"%#",secondSplitArray);

Answer 2

Do like following way:
NSMutableArray * genresArray = [NSMutableArray new];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"NOT (id IN %#)", genresArray];
NSArray *filterArray = [Yourarray filteredArrayUsingPredicate:predicate];
NSLog(#"filter: %#",filterArray);

Answer 3

Try This One For Above Scenario:
NSDictionary *yourJson;
NSMutableArray *array1 = [[yourJson valueForKey:#"results"] mutableCopy];
NSMutableArray *array2 = [[yourJson valueForKey:#"results2"] mutableCopy];
for(int i =0 ; i<array2.count ; i++)
{
NSString *objectFromarray2 = [array2 objectAtIndex:i];
for(int j =0 ; j<array1.count ; j++)
{
NSDictionary *objectFromarray1 = [array2 objectAtIndex:i];
if([[objectFromarray1 valueForKey:#"id"] isEqualToString:objectFromarray2])
{
[array2 removeObjectAtIndex:i];
[array2 insertObject:objectFromarray1 atIndex:i];
[array1 removeObject:objectFromarray1];
}
}
}

Answer 4

Yes, you can do that using NSPredicate, but for that you first have to store all your dictionary objects into one NSArray or NSMutableArray whatever suits to your requirement.

Answer 5

Do like:
NSString *search1 = #"3";
NSString *search2 = #"1";
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"(ANY SELF == %#) OR (ANY SELF == %#)", search1,search2];
NSArray *filtered = [Yourarray filteredArrayUsingPredicate:predicate];

Answer 6

one way to do in Swift - 3 using filter and map
let resultArray = results["results"]!
let genArray = genres["genres"]!
var result1Array : [[String:Any]] = resultArray
var result2Array : [[String:Any]] = []
for gen in genArray {
if let elm = resultArray.filter({ $0["id"] as! Int == gen }).first {
result2Array.append(elm)
result1Array = result1Array.filter({ $0["id"] as! Int != elm["id"] as! Int })
}
}
print(["result2":result2Array])
print("\n")
print(["result1":result1Array])