drhyde drhyde - 3 months ago 5
Ruby Question

What is a simple / elegant way in Ruby to tell if a particular variable is a Hash or an Array?

To check what

@some_var
is, I am doing a

if @some_var.class.to_s == 'Hash'


I am sure there is a more elegant way to check if
@some_var
is a
Hash
or an
Array
.

Answer

You can just do:

@some_var.class == Hash

or also something like:

@some_var.is_a?(Hash)

It's worth noting that the "is_a?" method is true if the class is anywhere in the objects ancestry tree. for instance:

@some_var.is_a?(Object)  # => true

the above is true if @some_var is an instance of a hash or other class that stems from Object. So, if you want a strict match on the class type, using the == or instance_of? method is probably what you're looking for.