How to check if an appropriate enumerable is a palindrome

Question

Obviously, a hash would not work for this kind of test. Anyways, here's what I have so far:

module Enumerable
  def palindrome?
    arr = []
    self.reverse_each do |x|
      arr << x
    end
    self == arr
  end
end

Another idea I had was to cycle through arr and self element by element with a for loop to check.

Is this a homework question by any chance? – Jason Apr 07 '13 at 16:09 — Jason, Apr 07 '13 at 16:09

Arup Rakshit · Answer 1 · 2013-04-07T04:53:34.323

2

x = 'Tiger'
p "#{x} is planidrome" if x ==  x.reverse #=> no ouput
x = 'RADAR'
p "#{x} is planidrome" if x ==  x.reverse #=> "RADAR is planidrome"

module Enumerable
  def palindrome?
    p  self.to_a ==  self.to_a.reverse
  end
end
['r','a','d','a','r'].palindrome? #=> true

edited Apr 07 '13 at 04:53

answered Apr 07 '13 at 04:00

Arup Rakshit

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This is for Strings, not Enumerables. – Rishi Apr 07 '13 at 04:31

score 2 · Accepted Answer · answered Apr 07 '13 at 04:36

2

module Enumerable
  def palindrome?
    a = to_a
    a == a.reverse
  end
end

answered Apr 07 '13 at 04:36

dbenhur

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How to check if an appropriate enumerable is a palindrome

2 Answers2