coffeescript - Why do we need to use unless and "?" together instead of if alone -
what need using unless , "?" when can use if in case
unless person.present? is equivalent
if person.present
they're not equivalent.
dosomething() unless person.present? execute if person.present null
dosomething() unless person.present execute if person.present false value
dosomething() if person.present execute if person.present true value
check compiled javascript.
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