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Construct A Constant From A String
Ruby's
Module.const_get
can be used to look for and retrieve the constant for a given name.
This can be used to construct a class name
> Object.const_get("Math")
#=> Math
> Object.const_get("Math")::PI
#=> 3.141592653589793
It can also be used to reference a constant
> Object.const_get("Math::PI")
#=> 3.141592653589793
You can even be more specific if you'd like
> Math.const_get("PI")
#=> 3.141592653589793
Symbols are valid as well
> Math.const_get(:PI)
#=> 3.141592653589793