Write a Ruby program that asks you for a string. Have the program remove any punctuation from the string and then print it out in reverse. ```ruby puts "Please enter a string:" stringin = gets.chomp stringout = [] stringin = stringin.scan(/\w/) { |letter| stringout << letter } puts stringout.join("").reverse ```

You can simplify your answer by using String#gsub (http://www.ruby-doc.org/core-2.1.4/String.html#method-i-gsub). ```ruby puts "Please enter a string:" user_string = gets.chomp userstring.gsub!(/\W/,'') # \W matches any non-word character [^a-zA-Z0-9] puts user_string.reverse ```

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Posted October 28, 2014 1:20am by

Ruby Foundations: Strings Extra Credit -- Is this the best way to do it?

Write a Ruby program that asks you for a string. Have the program remove any punctuation from the string and then print it out in reverse.

puts "Please enter a string:"
string_in = gets.chomp
string_out = []

string_in = string_in.scan(/\w/) { |letter| string_out << letter }
puts string_out.join("").reverse

2 Answers

October 28, 2014 7:38am

You can simplify your answer by using String#gsub.

puts "Please enter a string:"
user_string = gets.chomp

user_string.gsub!(/\W/,'') # \W matches any non-word character [^a-zA-Z0-9_]
puts user_string.reverse

October 28, 2014 6:39pm

Thanks!

November 15, 2014 7:22pm

Why the / before and after the /W?

November 15, 2014 8:22pm

They are the delimiters for Regular Expression strings in Ruby. Take a look at http://en.wikipedia.org/wiki/Regular_expression#Delimiters for more information.

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Alex Stophel

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Ruby Foundations: Strings Extra Credit -- Is this the best way to do it?

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Daniel Reedy

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Alex Stophel

Alex Stophel

Josh Arnold

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Daniel Reedy

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