ruby - How do I iterate through an array and change characters efficiently? -


i have method in work ruby assignment need change vowels , consonants in name put in user, next successive vowel/consonant, ( = e, e = i, etc.) , same process consonants ( b = c, d = f, etc.). did 'easy' way, need change instead, iterating through array , changing vowels/consonants way.

i new iteration having trouble this.

here original method: 

puts "what full name?" full_name = gets.chomp   def vowelreplace(full_name)  vowels = 'aeiou'  replacements = 'eioua'  full_name.tr(vowels, replacements) end  name_next_vowel = vowelreplace(full_name)  p name_next_vowel  def consonantreplace(name_next_vowel)   consonants = 'bcdfghjklmnpqrstvwxyz'   replacements = 'cdfghjklmnpqrstvwxyzb'   name_next_vowel.tr(consonants, replacements) end  new_spyname = consonantreplace(name_next_vowel)  p new_spyname

here's i've started working change below using array , block method. there easier less lengthy way of doing this? there .next way of doing this, or in general, more efficient way? 

puts "what first name?" first_name = gets.chomp   arr = first_name.split("")   p arr   arr.map! { |element|   if(element == "a")     "e"    elsif(element == "e")     "i"   elsif(element == "i")     "o"   elsif(element == "o")     "u"   elsif(element == "u")     "a"   else     element   end  }  p arr  new_arr = arr  new_arr.map! { |element|   if(element == "b")     "c"    elsif(element == "c")     "d"   elsif(element == "d")     "f"   elsif(element == "f")     "g"   elsif(element == "g")     "h"   elsif(element == "h")     "j"   elsif(element == "j")     "k"   elsif(element == "k")     "l"   elsif(element == "l")     "m"   elsif(element == "m")     "n"   elsif(element == "n")     "p"   elsif(element == "p")     "q"   elsif(element == "q")     "r"   elsif(element == "r")     "s"   elsif(element == "s")     "t"   elsif(element == "t")     "v"   elsif(element == "v")     "w"   elsif(element == "w")     "x"   elsif(element == "x")     "y"   elsif(element == "y")     "z"   elsif(element == "z")     "b"   else      element   end  }  p new_arr   arr.join("")

i tr approach, if want similar next, array#rotate option; here's example:

def letter_swap(full_name)   vowels     = %w(a e o u)   consonants = %w(b c d f g h j k l m n p q r s t v w x y z)    full_name.each_char.with_object("") |char, new_name|     if vowels.include?(char)       new_name << vowels.rotate(vowels.index(char) + 1).first     elsif consonants.include?(char)       new_name << consonants.rotate(consonants.index(char) + 1).first     else       new_name << char     end   end end

of course dry code, @ expense of readability (imo); example:

def letter_swap(full_name)   letters = [%w(a e o u), %w(b c d f g h j k l m n p q r s t v w x y z)]    full_name.each_char.with_object("") |char, new_name|     group = letters.find { |group| group.include?(char) }     new_name << (group.nil? ? char : group.rotate(group.index(char) + 1).first)   end end

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