From: Amos King <amos.l.king@...>
Date: 2008-09-17T23:21:19+09:00
Subject: Re: array question

That only works if they are touching and that can be accomplished with
inject really easy.

([1,2,2,3]+[1,4,7,7]).sort..inject([]) { |final, e| fianl[-1] == e?
final[0..-2] : final << e }
#=> [3,4]


([1,2,3]+[1,4,7]).sort..inject([]) { |final, e| fianl[-1] == e?
final[0..-2] : final << e }
#=> [2,3,4,7]

although with the later one you can just do
([1,2,3]+[1,4,7]).uniq

On Tue, Sep 16, 2008 at 10:08 AM, Tod Beardsley <todb@planb-security.net> wrote:
> Case 1 and 2, maybe the desired result?
>
> irb(main):088:0> def there_can_be_only_one(arr)
> irb(main):089:1>   arr.sort!.collect {|x| (arr[arr.index(x)] !=
> arr[arr.index(x)+1] ? x:nil)}.compact
> irb(main):090:1>   end
> => nil
> irb(main):091:0> there_can_be_only_one([1,2,3] + [1,4,7])
> => [2, 3, 4, 7]
> irb(main):092:0> there_can_be_only_one([1,2,2,3] + [1,4,7,7])
> => [3, 4]
> irb(main):093:0>
>
> ...assumes the elements to be compared are all the same type (Fixnums
> can't sort with Strings, eg)
>
> On Tue, Sep 16, 2008 at 9:29 AM, Nathan Powell <nathan@nathanpowell.org> wrote:
>> On Tue, Sep 16, 2008 at 11:25:00PM +0900, Amos King wrote:
>>> Forgot to ask what he was looking for.
>>
>> In the original email:
>>
>> <snip>
>> For example, array1=[1,2,3],array2=[1,4,7]
>> the return array is [2,3,4,7]
>> </snip>
>>
>> It's not entirely clear as one could arrive at that final array a couple
>> ways.
>>
>> --
>> nathan
>> nathan_at_nathanpowell_dot_org
>>
>> At this point, anyone proposing to run Windows on servers should be prepared
>> to explain what they know about servers that Google, Yahoo, and Amazon don't.
>>                 ~ Paul Graham
>> ------------------------------------
>>
>>
>
>
>
> --
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>
>



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Amos King
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