If you do this:
$ nil
=> nil
But if you do this:
$ !nil
=> true
Why is !nil true?
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When you use a boolean operator like
!on an object in Ruby the object must first be converted, behind the scenes, to a boolean value (trueorfalse). Every object in Ruby is either “truthy” or “falsy,” and Ruby’s implementors have chosen fornilto be falsy, so!nilis equivalent to!false, which evaluates totrue.