csv_users.rb

#variables________________________________________________

request=nil

#methods__________________________________________________________________

def mainmenu
    puts 'select an option please
    1.- new user
    2.- delete user
    3.- consult user
    4.- exit
  type a number: '

  option=gets.chomp

  choose = case option
  when '1' then create_new_user
  when '2' then
    puts 'please type the name of the user'
    request=gets.chomp
    delete_user(request)
  when '3' then
    puts 'please type the name of the user'
    request=gets.chomp
    consult_user(request)
  when '4' then Process.exit
  end
end

def create_new_user
  p 'name'
  name=gets.chomp
  p'age'
  age=gets.chomp
  p'phone'
  phone=gets.chomp
  p'address'
  address=gets.chomp
  File.open('data.csv','a') do |file|
    file.puts("#{name}, #{age}, #{phone}, #{address}") end
  mainmenu
end

def delete_user(user)
  myarray=[]
  string=""
  File.open('data.csv','r') do |myfile|
  myfile.each {|line|
  myarray << line.split(/(?<=,)\s/)
  }
  myarray=myarray.select{|x| x unless x.first.nil? || x.first=="\n"}
  myarray.each_index {|index|
  myarray.delete_at(index) if myarray[index].include?("#{user},")
  }
p myarray
  end
  puts "lengthy= #{myarray.length}"
  File.open('data.csv','w') do |file|
    myarray.each {|innerarray|
      innerarray.each{|element|
        element.end_with?(',')? file.print("#{element} ") : file.print(element)
      }
    }
  end
  mainmenu
end

def consult_user(user)
  File.open('data.csv','r') do |myfile|
  myfile.each {|line|
  puts line if line.start_with?(user)} end
  mainmenu
end

#__________________________________________________________________________
#______BODY________________________________________________________________

mainmenu

#__________________________________________________________________________

=begin
data.csv
eduardo, 23, 3124567, sanisidro 23
arturo, 32, 3245678, la calua 78
jorge, 45, 2345678, javier mina 4
=end

data.csv