Question

I have 3 NSMutableArrays: a,b,c.

a= [b copy];
a= [c copy];

What happens to the elements that were first copied (from b)?

In my use -case, a is an array I use as DataSource for tableview, while b, an c are arrays that take the place of datasource when needed.
Thanks

Concrete example. In the end I got to use setArray.

-(IBAction)selectTab:(id)sender {
    if ([(UIButton*)sender tag] == 1000) {
        if (![self.butonLocuri isSelected]) {

            [tableDataSourceArray setArray:locuriArray];
            [self addPins:self.tableDataSourceArray];
            [self.myTableView reloadData];
        }
    }

    if ([(UIButton*)sender tag] == 2000) {

        if(![self.butonEvenimente isSelected]){

            [tableDataSourceArray setArray:evenimenteArray];
            [self addPins:self.tableDataSourceArray];
            [self.myTableView reloadData];


        }


    }
}

Answer 1

a= [b copy]; // a is pointing to [b copy] memory location.   
a= [c copy]; // a is pointing to [c copy] memory location.   

You should use setArray: method.

[a setArray:b];
[a setArray:c];