Why Treat 0 as True in Ruby?

Question

I\'m reading through the excellent Ruby on Rails Tutorial and have encountered the following code.

if 0
  true
else
  false
end

The above r

Answer 1

In ruby, if exists, it's true. If not, it's false.

so, with Ruby null(no address assigned) and false are only false.

All others are true because it has address assigned to it.

I think of this way; "Does it exist?"