>>>>> "JG" == Jim Green <student.northwest...@gmail.com> writes:
JG> On Thu, Mar 3, 2011 at 6:31 PM, Jim Gibson <jimsgib...@gmail.com> wrote:
>> On 3/3/11 Thu Mar 3, 2011 3:11 PM, "Jim Green"
>> <student.northwest...@gmail.com> scribbled:
>>
>>> On Mar 3, 5:44 pm, shawnhco...@gmail.com (Shawn H Corey) wrote:
>>>> On 11-03-03 05:40 PM, Jim Green wrote:
>>>>
>>>>> But is there a easier way of
>>>>> doing this I might not be aware of?
>>>>
>>>> Given your brief description, no. The problem is that you can't output
>>>> the first datum without reading the last, because the last may be the
>>>> first thing that needs to be outputted.
>>>
>>> Hello, let me generalize this problem,
>>> lets say I have a hash with 2 levels of keys,
>>> I want to convert this hash to another hash but with the 2 levels of
>>> keys reversed.. I hope there is a module or sth that can do it.
>>
>> That is a simple problem that doesn't need a module (although one may
>> exist).
>>
>> Untested:
>>
>> my %oldhash = ( a => { b=>c, d=>e }, f => {g=>h, i=>j}, ... );
>> my %newhash;
>> for( my($key1,$val1) = each %oldhash ) {
>> for( my($key2,$val2) = each %{$val1} ) {
>> $newhash{$key2}->{$key1} = $val2;
>> }
>> }
JG> Thanks Jim, this will definitely work. but changing order of keys is a
JG> general problems and hopefull some module exists to do that.
hash keys have no order. this is true even when serialized to a string
in any format (yaml, dumper, json, etc.). when read back in, the order
in the string will be lost in most any lang. so expecting order there is
a bad idea.
uri
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