Ah ha. That makes delete actually quite cool function. Thank you.
Trausti
On Sat, Apr 17, 2010 at 12:48 PM, Frederick Cheung
<frederick.che...@gmail.com> wrote:
>
>
> On Apr 17, 10:27 am, Trausti Thor Johannsson <traust...@gmail.com>
> wrote:
>> Yes yes, I think I have found my 2nd compiler bug (not counting
>> realbasic). I think I found an actual bug in Ruby, on all platforms
>> none the less (well linux and mac).
>>
>> if yu just run console or irb and do this
>>
>> ph = "no.305.week"
>>
>> b = ph+"5"
>> returns "no.305.week5"
>>
>> then do
>> b.delete ph
>>
>> and it returns empty string
>>
>> If you put anything BUT 5 in the string, everything works. Also if
>> you substitute 305 with something that is not a number only everything
>> works.
>
> I think you misunderstand what delete is supposed to do. It does not
> mean 'find occurrences of the substring and remove them'. Instead it
> removes any characters present in all of the arguments, so for example
>
> "a1b2c3d4e5".delete('12345') #=> 'abcde'
> "a1b2c3d4e5".delete('12345', '123') #=> 'abcd4e5'
>
> In your case the string b, by construction contains only characters
> present in ph (since the 5 that you add at the end of it is already
> present in ph)
>
> Fred
>>
>> I have put in more thoughts on this in my blog
>> :http://traustithor.blogspot.com/2010/04/most-funny-but-annoying-ruby-...
>>
>> If anyone can cast any idea on this as to why this is happening, I
>> would love to hear it. I know the bug is in the delete function, I
>> want some more and deeper idea as to why.
>> This is such an edge case.
>>
>> Trausti
>>
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