Grepline Challenge Pt 1

Palindrome.rb

# Palindrome checker

def palindrome?(s) 
  a = s.split("")
  while a.length > 1 do
    return false unless a.pop == a.shift
  end
  return true
end

Susbstring.rb

# Slightly more efficient way to get all substrings

def potential_palindrome_substrings(s)
  s.downcase!
  a = []
  (0...s.length).each do |i|
    j = i+1
    while(s.index(s[i],j)) do
      j = s.index(s[i],j) + 1 
      a << s[i..s.index(s[i],j-1)]
    end
  end
  return a
end