From: 7stud -- <bbxx789_05ss@...>
Date: 2011-04-05T08:41:04+09:00
Subject: Re: Using grep on subarrays - help!

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"]]

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