How do you view a sample of the call stack in ruby?

Question

I\'m investigating different optimization techniques, and I came across this post Analyzing Code for Efficiency? by someone who believes that sampling the call stack is more

Answer 1

You can throw an exception at any time, and then look at the $@ predefined variable, which returns an array of backtrace data. E.g. put this in foo.rb:

begin                                                                        
  raise 'foo'                                                                
rescue                                                                       
  puts $@                                                                    
end  

Then run it:

$ ruby foo.rb 
foo.rb:2:in `
'