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Truthiness of a value can be used in if-else constructs

suggest change

You do not need to use double negation in if-else statements. 

if 'hello'
    puts 'hey!'
else
    puts 'bye!'
end

The above code prints ‘hey!’ on the screen.

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Truthiness:
* Truthiness
* All objects may be converted to booleans in Ruby
* Truthiness of a value can be used in if-else constructs
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