Re: List.sortBy shows wrong result

Because, in the case of
l.sortBy(I => -I) // List(-2147483648, -2147483647)
the list will be sorted by applying the function I => -I to every element, 
sorting the resulting list, and then unapplying the function again (well, 
that's not really what happens, but you can think of it that way...).
So: -(-2147483648) == -2147483648
    -(-2147483647) == 2147483647
    -2147483648 < 2147483647

Op donderdag 25 februari 2016 10:06:46 UTC+1 schreef Chris:
>
> Yes, but why does this affect the sort order?
>
>
>
> Am Donnerstag, 25. Februar 2016 09:37:10 UTC+1 schrieb David Starner:
>>
>> The negation of -21474836848 in 32-bit two's complement arithmetic is 
>> -21474836848. There is no positive value corresponding to the negative of 
>> the minimal value in two's complement arithmetic.
>>
>> On Wed, Feb 24, 2016, 11:56 PM Chris <[email protected]> wrote:
>>
>>> Hi all,
>>>
>>>
>>> List.sortBy show a strange behaviour:
>>>
>>> val l = List(Int.MinValue, Int.MinValue+1)
>>> l.sortBy(I => I)  // List(-2147483648, -2147483647)
>>> l.sortBy(I => -I) // List(-2147483648, -2147483647)
>>>
>>>
>>> If I use other values anything seems ok
>>>
>>> val l = List(Int.MinValue+2, Int.MinValue+1)
>>> l.sortBy(I => I)  // List(-2147483647, -2147483646)
>>> l.sortBy(I => -I) // List(-2147483646, -2147483647)
>>>
>>>
>>> What's wrong here?
>>> Can anyone help? Thanks in advance.
>>>
>>> Chris
>>>
>>>
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