I don't know exactly what you are trying to address (sounds like an XY Problem to me). You can use any string as a key in a hash, as long as it is unique in the hash, but building a hash whose keys are the concatenated values of other keys sounds like a design problem to me, maybe other data structures should be used instead

Could you please give a step backwards and elaborate a bit more the kind of problem you are trying to solve and why do you think that such a hash is a good option?

citromatik

• Comment on Re: can i concatenate various value to form a unique key

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Re^2: can i concatenate various value to form a unique key
by Anonymous Monk on Jul 03, 2009 at 10:15 UTC
Hi, I am planning to have a hash like
```   %hash = {g1 => [start_date1,end_date2]
g2 => [start_date1,end_date2]
};
but i dont have a unique value of g1 and g2.. i will get unique value with combination of some values like value1 value2 value3 ..value5 so i planned to derive g with concatenation of these values assuming that a hash cannot have mutiple values of as a key. I thik the background is explained better now.
At the risk of getting into more trouble in this thread, I do not think that this will work out well for you. There can be very good reasons to concatenate strings into a single hash key, but once we are talking about 5 FIVE dimensions, this doesn't make sense. I apologize for not reading this thread carefully from the beginning.

sounds like you need an Array of Hash.

```each hash like:
start => "some start date",
end   => "some end date",
parm1 => "some data1",
parm2 => "some data2",
parm3 => "some data3",

Maybe I am wrong, but contrary to the others who have replied already, I think you are misinterpreting your problem (sorry if I misinterpreted you! :).

Do you want the following:

```%hash = (
g1 => [value1, value2, value3],
g2 => [value4, value5, value6...]
);