Hidden features of Ruby

by

From Ruby 1.9 Proc#=== is an alias to Proc#call, which means Proc objects can be used in case statements like so:

def multiple_of(factor)
  Proc.new{|product| product.modulo(factor).zero?}
end

case number
  when multiple_of(3)
    puts "Multiple of 3"
  when multiple_of(7)
    puts "Multiple of 7"
end

More Related Contents:

  1. Can’t output currency in ruby with money-gem [closed]
  2. Very Basic Ruby puts and gets
  3. What does map(&:name) mean in Ruby?
  4. What does the (unary) * operator do in this Ruby code?
  5. How to sort an array in descending order in Ruby
  6. How to debug Ruby scripts [closed]
  7. How can I find which operating system my Ruby program is running on?
  8. What does @@variable mean in Ruby?
  9. Difference between DateTime and Time in Ruby
  10. What does send() do in Ruby?
  11. How does the magic comment ( # Encoding: utf-8 ) in ruby​​ work?
  12. Why does Ruby seem to hoist variable declarations from inside a case statement even if that code path is not executed? [duplicate]
  13. Where is Ruby’s string literal juxtaposition feature officially documented?
  14. Need a simple explanation of the inject method
  15. Office 365 Rest API – Daemon week authentication
  16. Access variables programmatically by name in Ruby
  17. How do I temporarily redirect stderr in Ruby?
  18. Confusion with Atomic Grouping – how it differs from the Grouping in regular expression of Ruby?
  19. Extract number from string in Ruby
  20. Using layouts in HAML files independently of Rails
  21. How to implement a short URL like the URLs in Twitter?
  22. ‘||=’ operator in Ruby
  23. When do Ruby instance variables get set?
  24. Is order of a Ruby hash literal guaranteed?
  25. Running a Ruby Program as a Windows Service?
  26. Where is it legal to use ruby splat operator?
  27. Net::ReadTimeout (Net::ReadTimeout) Selenium Ruby
  28. How to get class instances in Ruby? [duplicate]
  29. In Ruby, why does nil[1]=1 evaluate to nil?
  30. Rails ‘parse_query’ error on server in brand new app

Leave a Comment