Question

In my program I want to add a method for double letters in a string. My question is there a public method to that? For example:

'The' → TThhee'

Here’s what I have:

puts "Please enter text: "
input = gets
letters = input.chomp.to_s
puts "You entered: " + letters + "."

list_letters = letters.split(//)
list = list_letters.join(". ")* 2.to_i  

puts "Your text is made up of the letters: " + list + "."

Answer 1

letters.gsub(/(.)/, '\1\1')

or even shorter:

letters.gsub(/./, '\&\&')

A bit more comfortable:

class String
  def char_duplicate
    self.gsub(/./, '\&\&')
  end
end

puts "abc".char_duplicate #aabbcc
puts "abca".char_duplicate #aabbccaa

---

Your example code makes something different. Perhaps you wanted to do something like:

 letters.split(//).map{|x| x * 2 }.join

or

 letters.each_char.map{|x| x * 2 }.join