How do I return an array of arrays with user input?

Question

the code below will put names into groups (e.g. first person goes into first group, second person goes into second group etc).

I'd like to enter the final piece of code and request user to input the number of the group. This should then print the people in that group, each separated by a comma and a space. Group numbers are "1-indexed". This means that, if the user enters 1, the first group should be printed, not the second group. Keep on asking the user for (final) group numbers until the user enters stop.

puts "How many groups would you like?"
group_num = gets.chomp.to_i

array = Array.new(group_num) { [] }

puts "Enter one name at a time"
count = 0
 while input_name = gets.chomp
  if input_name == "stop"
    break
  else puts "Give me a name"
   array[count] << input_name
   count += 1
   count = 0 if count == group_num
  end
 end

array.inspect

So if array = [["John", "Steve"], ["Judy", Pete"]] and the group number requested is 2, the output should print: "Judy, Pete" (on the same line).

No, there can be as many groups and names as specified by the user. The final piece of code just needs to request which group number the user would like to see. Everything else has already been achieved in the original code. — Oliver Todd
– Oliver Todd, Commented May 8, 2019 at 13:33
See my answer anyway, it might help. Also it's a good idea on Stackoverflow to allow time for other possible answers before marking the very first answer as "accepted" as there are many ways to solve the same problem. — lacostenycoder
– lacostenycoder, Commented May 8, 2019 at 13:41

Ursus · Accepted Answer · 2019-05-08 13:21:13Z

1

Given the array and the index wanted is very simple

array = [["John", "Steve"], ["Judy", "Pete"]]
puts "tell me which group you want with a number"
number = gets.to_i
if (1..array.length).include?(number)
  puts "people: #{array[number - 1].join(", ")}"
else
  puts "Number element not present"
end

edited May 8, 2019 at 13:21

answered May 8, 2019 at 13:01

Ursus

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2 Comments

Oliver Todd Over a year ago

What I need is for the input to be requested from the user. So for example: puts "Enter your group number" and then this will return the new group of names. I know it should be pretty simple with "gets"...

Ursus Over a year ago

I updated my answer. It seems to me you already know how to ask for an input and gets it. Anyway, I think you just need to paste my code at the end of your and remove my first line

lacostenycoder · Accepted Answer · 2019-05-08 13:36:43Z

0

I think this is what you want you program to do? Try to run it:

array = []
puts "How many groups would you like?"
group_num = gets.chomp.to_i

group_num.times do
  puts "\nEnter one name at a time"
  a = []
  loop do
    puts "Give me a name or 'stop' to stop adding names"
    input_name = gets.chomp
    break if input_name == "stop"
    a << input_name
  end
  array << a
end

array.each_with_index{|a, i| puts "#{i+1}. #{a}" }
puts "select number which group you want"
group = gets.chomp.to_i - 1
puts "you selected group: #{array[group].to_s}"

answered May 8, 2019 at 13:36

lacostenycoder

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