Mutable array merge array to another array

Question

I have two mutable arrays:

NSMutableArray array1; [containing 1,2,3,4,5]

NSMutableArray array2; [containing 9,8,7]

I want to insert array2 values to array1 between 3 and 4, so the result could be:

array1 = [1,2,3,9,8,7,4,5]

Again I want to remove array2 values from array1, so the result could be:

array1 = [1,2,3,4,5]

Please suggest me some best approach to achieve it.

The below links doesn't help: Copy object at specific index of mutable array to the end of another array

its fix that you want to insert array2 at 4th index into array1? — CodeChanger, Mar 01 '17 at 17:52
No, at any index I can insert array2, but yes at one time, it will be given the index value. — Renuka Pandey, Mar 01 '17 at 17:54
@Ren You need to add object after object 3 that fix right? Means always between object 3 and 4. — Nirav D, Mar 01 '17 at 17:57
I'm not sure what you're trying to do. You need to add `array2` and then remove it? Isn't the result just going to be the same as `array1`'s initial value every time? — NobodyNada, Mar 01 '17 at 18:33

CodeChanger · Accepted Answer · 2019-08-01T12:36:17.697

Based on your requirement you can split your first array into 2 part and merge all 3 array to final array for getting expected output.

Please check this code:

    NSMutableArray *mutArray1 = [[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5", nil];
    NSMutableArray *mutArray2 = [[NSMutableArray alloc] initWithObjects:@"9",@"8",@"7", nil];

    //You cna change index based on your requirement.
    int indexToSpit = 3;

    //Split your first array into 2 part.
    NSArray *arayFirstPart = [mutArray1 subarrayWithRange:NSMakeRange(0, indexToSpit)];
    NSArray *araySecondPart = [mutArray1 subarrayWithRange:NSMakeRange(indexToSpit, mutArray1.count-indexToSpit)];

    //Merge all 3 array into single array
    NSMutableArray *finalArray = [[NSMutableArray alloc] initWithArray:arayFirstPart];
    [finalArray addObjectsFromArray:mutArray2];
    [finalArray addObjectsFromArray:araySecondPart];

    NSLog(@"Combine Array : %@",finalArray);

    //For remove
    [finalArray removeObjectsInArray:mutArray2];

    NSLog(@"Split Array : %@",finalArray);

Hope this will helps you.

Thanks! lemme check it. – Renuka Pandey Mar 01 '17 at 18:25 — Renuka Pandey, Mar 01 '17 at 18:25

score 0 · Answer 2 · answered Mar 01 '17 at 18:23

var array1 =  [1,2,3,4,5]
var array2 =  [9,8,7]

for inserting array2 at index 3 use

array1.insertContentsOf(array2, at: 3)
print(array1)

for removing you can either use

array1 = Array(Set(array1).subtract(array2))

which will be unordered array as we are converting a Array to Set for subtraction.

or you can try

    var array3 =  [1,2,3,4,5]
       //assuming array1 as [1,2,3,9,8,7,4,5]
    let array4 = array1.filter({array3.contains($0)}) 
    print(array4) //will give you desired ordered array

Thanks jagdeep, but i am using objective C. – Renuka Pandey Mar 01 '17 at 18:24 — Renuka Pandey, Mar 01 '17 at 18:24

Mutable array merge array to another array

2 Answers2