Check if module exists in ruby

Question

I'm dynamically defining a module name from an argument passed on the cli, for example Required::Module::#{ARGV.first}

Is there any way to check if that module exists? Also, how would I run methods on it not knowing it's exact name?

Answer 1

Use const_defined? for this.

Required::Module.const_defined?(:ModuleName)

returns true or false.

Answer 2

defined?(Required::Module)

gives "constant" if it exists, and nil if it doesn't.

Update: Sorry, didn't read your question properly.

defined?(eval("Required::Module::"+string))

should give you what you're after.