Finding the Caller in Ruby

In Ruby, it can be really useful to know, in the flow of execution, the call stack within a certain method. For that we have Kernel#caller.

#caller returns an Array representing the current call stack, where each element is a String like "file:line in 'name'". Here’s an example:

def actually_do_it
  caller.join("\n")
end

def do_it
  actually_do_it
end

puts do_it

which will output:

ex.rb:8:in `do_it'
ex.rb:11:in `<main>'