From: Abder-rahman Ali <abder.rahman.ali@...>
Date: 2010-07-13T01:35:35+09:00
Subject: Substitution

I have this part of code from "Why's poignant guide to Ruby" that is
intended to make substitution:

Note: code_words here is a hash

...
idea = gets
code_words.each do |real, code|
idea.gsub!(real, code)
end
...

I know that "real" is what to find, and "code" is what to put in place.
But, what I'm not getting here is why is this written:

idea.gsub!(....

I don't mean the gsub! method, but, why "idea"? What does it here? How
can we read that line of script?

Thanks.
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