On Oct 21, 2008, at 9:08 AM, Stefan Wolfrum wrote:
Hi all,I have an array. Each array entry is a dictionary. Each dictionary has two key/value pairs (all are strings).Now I get from somewhere else the value (a string) corresponding to one of the keys. It's exactly the same string, content-wise (not address-wise). What I need: a reference/pointer to THAT dictionary inside the array which contains this string as the value of the key (I know what key it is).How would I do that?My knowledge is: to get an array's entry I just have the objectAtIndex: method. But then I'd need the index where the dictionary I'm looking for is. How would I get the index without, of course, iterating through all the array's entries and looking at every dictionary and comparing my given value with all the values inside the dictionaries?
First: is iterating over the array contents really causing a performance problem? Or is it just algorithmically offensive and you'd like to make it go away in the name of code aesthetics? Maybe it doesn't need to be changed at all, but if it does....
Change your model.Your current model -- your current object graph that consists of an array of dictionaries -- does not support a lookup pattern that you need to do.
So, change the model.If order isn't important, maybe your array should really be a dictionary.
If order is important, you could use a dictionary to store the items and an array of keys in item order.
b.bum
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