CODEWITHSUNDEEP
iosobjective-ciphonealgorithm
Jacob Billings
Jacob Billings

Reputation: 21

How to remove an object from other keys in a dictionary [Objective-C]?

I have an NSMutableDictionary as follows: 

{ 0 = (1,5,6); 1 = (0,2,6,7); 2 = (1,7,8); 5 = (0,6,10,11); 6 = 
(0,1,5,7,11,12)};

in the format of {NSNumber:NSMutableArray}

I want to remove every 0 that is there in every key or the keys for the values of '0'. What is a way to do it?

The expected outcome is:

{ 0 = (1,5,6); 1 = (2,6,7); 2 = (1,7,8); 5 = (6,10,11); 6 = 
(1,5,7,11,12)};

I am looking for an elegant solution.

Upvotes: 2

Views: 793

Answers (4)

Harshal Shah
Harshal Shah

Reputation: 427

You can do like below. This is improvement of other answer with key '0'. 

NSMutableDictionary *dict = [NSMutableDictionary new];
dict[@"0"] = @[@1,@5,@6];
dict[@"1"] = @[@0,@2,@6,@7];
dict[@"2"] = @[@1,@7,@8];
dict[@"5"] = @[@6,@10,@11];
dict[@"6"] = @[@0,@1,@5,@7,@11,@12];

int valueToRemove = 0; //change this value for what you need to remove

for (NSNumber * key in dict.allKeys) {    
    if([key intValue] == valueToRemove) {     
        dict[key] = [dict[key] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"intValue != %i",valueToRemove]];      
    }else{         
        dict[key] = [dict[key] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"intValue != %i",valueToRemove]];     
    }  
}

NSLog(@"%@",dict);

And your expected output like this with key '0'.

{ 
0 =  ( 1, 5, 6 );
1 =   ( 2, 6, 7 );
2 =   ( 1, 7, 8 );
5 =   ( 6, 10, 11 );
6 =   ( 1, 5, 7, 11, 12 );
}

Upvotes: 0

Reinier Melian
Reinier Melian

Reputation: 20804

Use this assuming that your NSMutableArray is an NSNumber array, also the key 0 is removed in this improvement

Improved

NSMutableDictionary * dict = [NSMutableDictionary dictionary];
dict[@0] = [NSMutableArray arrayWithObjects:@0,@10, nil];
dict[@1] = [NSMutableArray arrayWithObjects:@0,@10, nil];
dict[@2] = [NSMutableArray arrayWithObjects:@0,@7,@10, nil];

int valueToRemove = 0; //change this value for what you need
for (NSNumber * key in dict.allKeys) {
    if([key intValue] == valueToRemove) {dict[key] = nil;}
    dict[key] = [dict[key] filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"intValue != %i",valueToRemove]];
}

NSLog(@"%@",dict);

CONSOLE LOG

2017-07-28 02:18:21.257 ArrayProblemQuestion[76557:1576267] {
    1 =     (
        10
    );
     2 =     (
         7,
         10
     ); }

if you want to loop only for certain keys then

NSMutableArray * array = [NSMutableArray arrayWithObjects:@1,@3,@0, nil];
    for (NSNumber * key in [dict.allKeys filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"intValue IN %@",array]]) {
        NSLog(@"%@",key);
    }

this will loop only for the keys contained in array

Hope this helps

Upvotes: 1

William GP
William GP

Reputation: 1332

I'd do something like this..

 [myDict enumerateKeysAndObjectsUsingBlock:^(NSNumber * _Nonnull key,
                                            NSMutableArray * _Nonnull array,
                                            BOOL * _Nonnull stop) {

    [array removeObject:@0];
}];

Upvotes: 0

Nirmalsinh Rathod
Nirmalsinh Rathod

Reputation: 5186

  // This is your input
NSMutableDictionary *dicMain = [NSMutableDictionary new];
dicMain[@"0"] = @[@1,@5,@6];
dicMain[@"1"] = @[@0,@2,@6,@7];
dicMain[@"2"] = @[@1,@7,@8];
dicMain[@"5"] = @[@0,@6,@10,@11];
dicMain[@"6"] = @[@0,@1,@5,@7,@11,@12];


    NSLog(@"%@",dicMain);
    // Remove key from Dic if its having 0
    if([[dicMain allKeys] containsObject:@"0"])
        [dicMain removeObjectForKey:@"0"];

   // Check each and every object into all key's that if its having 0 then it will remove 
    NSArray *aryAllKeys = [dicMain allKeys];
    for(NSString *strKey in aryAllKeys)
    {
        NSMutableArray *aryNewValue = [NSMutableArray new];
        NSArray *aryKeyValues = [dicMain objectForKey:strKey];
        for(NSString *str in aryKeyValues)
        {
            if([str intValue] != 0)
            {
                [aryNewValue addObject:str];
            }
        }
        // Set New array
        [dicMain setObject:aryNewValue forKey:strKey];
    }
    NSLog(@"%@",dicMain);

The output of main Dic without removing 0:

{ 1 = ( 2, 6, 7 ); 2 = ( 1, 7, 8 ); 5 = ( 0, 6, 10, 11 ); 6 = ( 0, 1, 5, 7, 11, 12 ); }

After Removing 0: { 1 = ( 2, 6, 7 ); 2 = ( 1, 7, 8 ); 5 = ( 6, 10, 11 ); 6 = ( 1, 5, 7, 11, 12 ); }

Upvotes: 0

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