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const_get 

        # Module.const_get

(from ruby core)
---
    mod.const_get(sym, inherit=true)    -> obj
    mod.const_get(str, inherit=true)    -> obj

---

Checks for a constant with the given name in *mod*. If `inherit` is set,
the lookup will also search the ancestors (and `Object` if *mod* is a
`Module`).

The value of the constant is returned if a definition is found,
otherwise a `NameError` is raised.

    Math.const_get(:PI)   #=> 3.14159265358979

This method will recursively look up constant names if a namespaced
class name is provided.  For example:

    module Foo; class Bar; end end
    Object.const_get 'Foo::Bar'

The `inherit` flag is respected on each lookup.  For example:

    module Foo
      class Bar
        VAL = 10
      end

      class Baz < Bar; end
    end

    Object.const_get 'Foo::Baz::VAL'         # => 10
    Object.const_get 'Foo::Baz::VAL', false  # => NameError

If the argument is not a valid constant name a `NameError` will be
raised with a warning "wrong constant name".

    Object.const_get 'foobar' #=> NameError: wrong constant name foobar

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