[Pharo-project] isHealthy

Henrik Sperre Johansen henrik.s.johansen at veloxit.no
Thu Apr 14 11:09:57 CEST 2011

On 14.04.2011 11:04, Stéphane Ducasse wrote:
>>>>> Hi igor
>>>>> this is strange I have a dictionary whose array contains nil  and still
>>>>> isHealthy returns true.
>>>>> can an array of a dictionary contains nil?
>>>> no, it can't .
>>>> And how you end up with dictionary which having array = nil? During
>>>> initialization, it allocates and initializes array,
>>>> so, normally, there is no way how it could be nil.
>>> Ehm, the array can _contain_ nil(the empty slot marker) (and it will in all
>>> cases, if it's working correctly), it cannot _be_ nil though.
>>> isHealthy has nothing to do with this though, it checks if all elements
>>> (non-nil entries in the array) are at positions which are valid.
>>> \
>> Err.. maybe i misunderstood?
>> i meant
>> dict array == nil
>> should not happen, but
>> (dict array at: someindex ) == nil
>> is quite normal.
> I do not know I have a do: loop and some elements are nil and break the loop.
> Stef

do: iterates the values in the Dictionary, and yes, it's perfectly valid 
to have a pair someKey -> nil in the dictionary.
Why you have it (ie who put it there), and if it should be valid in your 
case, you'd have to figure out :)


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