a bunch of methods that can be used with any other class (MIX IN)

a method is a group of several expressions(block) that can be referred by a name, passed arguments, associated with one or more objects

higher order function takes a function as a param or returns as a result

AREL relational algebra  returning the reply for the first comment, a table joining itself why is that easier in arel than sql, because sql qould require aliasing

CONTEXT
When    user logs out
when    user logs in
when    not valid

or

With


TEST

VALID

EDGE

NOT VALID

ex  describe destroy do
       context 1: WHEN resrouce found => 200
       context 2: WHEN resource not found
       context3 : WHEN resource not OWNED


expect DONT SHOULD
expect dont should
expect dont should
expect means in my mind i think i know what will come rather than should, if what comes isn't what i thought obligated

likelihood vs
obligation condemnation

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