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Re: Using grep on subarrays - help!

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Simon Harrison wrote in post #990886:
> Thanks for all the tips. I think #select fits best:
>
> file_results = @films.select { |a, b| /#{@film}/i =~ a }
>
>
> Just one question. Obviously in the above, a and b refer to the first
> and second elements in each subarray. Let's say we have this array:
>
> => [["one", "two", "three"], ["one"], ["two", "three"], ["one",
> "three"]]
>

Neither grep() or include?() depended on the size of the sub-arrays they 
are searching, so the answer is the same:


data = [
  ["one", "two", "three"],
  ["one"],
  ["two", "three"],
  ["one","three"]
]

target = 'one'

results = data.select do |arr|
  arr.include?(target)
end

p results

--output:--
[["one", "two", "three"], ["one"], ["one", "three"]]

However, if your target will only appear in the first position of the 
array, then it is much more efficient to just check the first element of 
each array:

data = [
  ["one", "two", "three"],
  ["ONE"],
  ["two", "three"],
  ["oNe","three"]
]

target = 'one'

results = data.select do |arr|
  arr[0].downcase == target
end

p results

--output:--
[["one", "two", "three"], ["ONE"], ["oNe", "three"]]

-- 
Posted via http://www.ruby-forum.com/.

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Using grep on subarrays - help! Simon Harrison <simon@simonharrison.net> - 2011-04-03 08:32 -0500
  Re: Using grep on subarrays - help! Jesús Gabriel y Galán <jgabrielygalan@gmail.com> - 2011-04-03 08:47 -0500
    Re: Using grep on subarrays - help! Adam Prescott <adam@aprescott.com> - 2011-04-03 09:44 -0500
      Re: Using grep on subarrays - help! Robert Klemme <shortcutter@googlemail.com> - 2011-04-04 04:13 -0500
  Re: Using grep on subarrays - help! Simon Harrison <simon@simonharrison.net> - 2011-04-03 08:58 -0500
  Re: Using grep on subarrays - help! 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-03 16:13 -0500
    Re: Using grep on subarrays - help! 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-03 16:49 -0500
  Re: Using grep on subarrays - help! Simon Harrison <simon@simonharrison.net> - 2011-04-04 14:06 -0500
    Re: Using grep on subarrays - help! Rob Biedenharn <Rob@AgileConsultingLLC.com> - 2011-04-04 14:44 -0500
    Re: Using grep on subarrays - help! 7stud -- <bbxx789_05ss@yahoo.com> - 2011-04-04 18:41 -0500
  Re: Using grep on subarrays - help! Simon Harrison <simon@simonharrison.net> - 2011-04-04 15:05 -0500
    Re: Using grep on subarrays - help! Rob Biedenharn <Rob@AgileConsultingLLC.com> - 2011-04-04 15:56 -0500

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