From: 7stud -- <bbxx789_05ss@...>
Date: 2009-04-27T10:52:55+09:00
Subject: Re: Deleting numbers in array

Clayton Lane wrote:
> David A. Black wrote:
>> Hi --
>> 
>> Clayton Lane wrote:
>>> I'm new to Ruby and unsure how to delete numbers in an array. I have an
>>> array filled with numbers from 1 to 100. If I use nums.delete_if {|x| x
>>> == 9 }, it will delete 9, but I want to remove any number containing 9.
>>> For example, 19, 39, 92, 99 etc. I tried using a wildcard, but it didn't
>>> work. I'm sure theres an easy command to do it, but I wasn't able to
>>> find it on in Ruby documentation. I also want to remove numbers
>>> containing 0,6,7, and 8 as well. Any help would be greatly appreciated.
>> 
>> You're pretty much going to have to convert the numbers to strings. For
>> example:
>> 
>>    array.delete_if {|x| x.to_s[/[06789]/] }
>> 
>> 
>> David
> 
> Wow! Ruby is so good! I'm unsure of how to do this final step too. If 
> any numbers don't contain 1, remove them. Any ideas?

arr = [51, 52, 20, 36, 79]
result = arr.delete_if {|x| x.to_s[/[06789]/]}
p result

--output:--
[51, 52]

result = arr.delete_if do |x|
  str = x.to_s
  str[/[02345]/] and not str[/1/]
end
p result

--output:--
[51]
-- 
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