I have an existing array to which i want to add an other array in the front of the existing array.
Add to the end is no problem with
[existingArray addObjectsFromArray:newArray];
But how to add it to the front?
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8 Answers
You can do this without a temporary array, and without assuming that newArray is an NSMutableArray, and without making an NSIndexSet:
[existingArray replaceObjectsInRange:NSMakeRange(0,0)
withObjectsFromArray:newArray];
1 Comment
Zoltán
Nice and elegant solution.
Same method, but invert the order and re-assign:
[newArray addObjectsFromArray:existingArray];
existingArray = newArray;
Comments
[newArray addObjectsFromArray:existingArray];
existingArray = newArray;
Hope,this will help you..enjoy...
Comments
You can create a 3rd array and add the elements in the order you want, then asing it back to the first one:
NSMutableArray *tempArray = [NSMutableArray arrayWithArray:newArray];
[tempArray addObjectsFromArray:existingArray];
Comments
For completeness' sake here's a very different way:
NSIndexSet *indexes = [NSIndexSet indexSetWithIndexesInRange: (NSRange) {0, [newArray count]}];
[existingArray insertObjects: newArray atIndexes: indexes];
Comments
You can try add objects to index below code:
[existingArray insertObjects:newArray atIndexes:0];
Thanks..!
1 Comment
Dmitry Nelepov
U will get error [NSMutableArray insertObjects:atIndexes:]: index set cannot be nil
Think the two first answers are more elegant, but here's another way:
Use:
[existingArray insertObjects:newArray atIndexes:indexSet];
where the indexSet runs from 0 to newArray.count-1 .
Comments
To insert jjust before the existing array u must use index 0
[newArray insertObject: existingArray atIndex:0]
1 Comment
user2387149
that whole insert the whole array at index 0
