Copy few elements of array to another

Question

i have two arrays say arrOne and arrTwo. now arrOne is having 27 elements and arrTwo is vacant. On click of a button i want to copy first 10 elements of arrOne to arrTwo, then on second click, i want to add another 10 elements and the rest 7 on another click. example with code would be really helpful,,.. thnx O_o

Did you try writing something in an attempt to implement this? If so, what happens when you run it? — occulus, Mar 01 '11 at 12:10
Questions of the form, "Here is a specification, please give me the code" aren't very useful. "I have a problem with my code that does X" is a more answerable question. — occulus, Mar 01 '11 at 12:13
ok.. should i use this?? [one](http://stackoverflow.com/questions/733243/how-to-copy-part-of-an-array-to-another-array-in-c) — Zaraki, Mar 01 '11 at 12:17
So a way for you to break this problem down is to a) work out how to hook up a button to some code you write, b) how to manipulate NSMutableArray objects (and use NSArrays) -- read the Apple API docs, c) tie it all together in some code you write, d) ask here again if you run into specific problems. — occulus, Mar 01 '11 at 12:21
You've tagged this question with iphone and objective-c, so I took it for granted you're using objective-c for the iphone. That question you linked to is about c#. objective-c is not c#. — occulus, Mar 01 '11 at 12:23

score 1 · Accepted Answer · edited Mar 01 '11 at 17:05

Here is how to do it:

    //
    // Filling first array with 20 elements
    //
    NSMutableArray* arrOne = [[NSMutableArray alloc] initWithObjects:nil];
    NSMutableArray* arrTwo = [[NSMutableArray alloc] initWithObjects:nil];

    for (int i=1; i<27; i++) {
        [arrOne addObject:[NSNumber numberWithInt:i]];
    }
    //
    // Adding 10 elements starting from initialPosition to second array
    //
    NSLog(@"arrOne: %@", [arrOne componentsJoinedByString:@", "]);
    int initialPosition = 0; // Just change the initial, starting position to 10, 20, 27 and so on..
    [arrTwo addObjectsFromArray:[arrOne objectsAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(initialPosition, 10)]]];
    NSLog(@"arrTwo: %@", [arrTwo componentsJoinedByString:@", "]);
    [arrOne release];
    [arrTwo release];

Copy few elements of array to another

1 Answers1