constant variable

How to make a variable constant in ruby so that the value remains
fixed throughout and cannot be altered at any cost

please checkout this

First off, repeated posting doesn't get you answers any faster - it
just demonstrates full-on n00bishness.

To answer your actual question, there isn't any way to make a value
that is truly un-alterable. See this post for more info:

If you're depending on a programming language to defend you against
programmers, you need to fire the programmers...

--Matt Jones