variable name from string in obj-c

Question

I have a bunch of variables named index1, index2, ..., indexn. I want to calculate i = array[index1] + array[index2] + ... + array[indexn]. I heard that I can do that in a loop, getting the current variable name from the loop index. How can I do that?

Having a bunch of numbered variables is clue #1 that there's something wrong with your program's structure. Why aren't they in an array or other appropriate compound object? — Nicholas Knight
– Nicholas Knight, Commented Jul 2, 2010 at 10:33

Paul R · Accepted Answer · 2010-07-02 10:48:28Z

4

Instead of having individual variables like this:

int index1, index2, index3, ...indexN:

you should consider using an array of indices:

int index[N];

and then you can sum in a loop, e.g.

sum = 0;
for (i = 0; i < N; ++i)
{
    sum += array[index[i]];
}

answered Jul 2, 2010 at 10:48

Paul R

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Eiko · Accepted Answer · 2010-07-02 10:28:28Z

0

Sorry, this is not possible in objective-c. It works for example in php.

There are ways to get objects by name if your data model allows for this, but in general variable names cannot be synthesized by name.

answered Jul 2, 2010 at 10:28

Eiko

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1 Comment

Eiko Over a year ago

This works only if you are using key value coding (KVC) to hold your variables. I think they are just plain ints in your code and not KVC compliant properties. May think about refactoring them into an array.

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