How to check if an object is iterable in Ruby?

Question

How do I check if an object is iterable in Ruby?

That is, I want a method that cleanly checks if an object is iterable, like so:

def is_iterable(my_object)   .. end 

I'm really not sure where to start on this short of explicitly naming classes from within the method.

Edit: For my purposes, let's say iterable is something you can do .each to.

Answer 1

For my purposes, let's say iterable is something you can do .each to.

You can just ask if this object has this method

def iterable?(object)   object.respond_to?(:each) end 

Answer 2

You already got some answers, but here are two more ways, Object#is_a?/Object#kind_of? and Module#===:

  [].is_a? Enumerable #=> true   "".is_a? Enumerable #=> false    Enumerable === [] #=> true   Enumerable === "" #=> false