Question

I manipulate an array of symbols, where some of them are potentially Ruby class names (e.g :Fixnum).

How can I select them ?

Of course, I don’t know in advance the complete list of these symbols…
Of course I do that in Ruby.

Answer 1

You can do the check with const_get if you check whether the const is defined first:

[:Integer, :Dog, :Fixnum, :String, :Rat].select{ |x| Object.const_defined?(x) && Object.const_get(x).class === Class }
=> [:Integer, :Fixnum, :String]