How to redefine a Ruby constant without warning?

Question

I\'m running some Ruby code which evals a Ruby file every time its date changes. In the file, I have constant definitions, like

Tau = 2 * Pi

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Answer 1

Unless the values of the constants are pretty weird (i.e. you have constants set to nil or false), the best choice would be to use the conditional assignment operator: Tau ||= 2*Pi

This will set Tau to 2π if it is nil, false or undefined, and leave it alone otherwise.