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Michael Wang thinks this is interesting:

Instance variables always begin with an @ sign, and are nil when undefined.

From

Cover of Ruby on Rails Tutorial: Learn Web Development with Rails, Third Edition

Chapter 4. Rails-Flavored Ruby
from Ruby on Rails Tutorial: Learn Web Development with Rails, Third Edition
by Michael Hartl
Publisher: Addison-Wesley Professional
Released: April 2015

Note

ruby #instance_variable

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