Ruby/Hash/clear

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clear a hash

counties = { "Three" => 3, "Five" => 5 }
counties.clear # bye-bye



clear method removes all the key-value pairs from a hash, leaving it empty

counties = { "Three" => 3, "Five" => 5 }
counties.clear # bye-bye
counties.empty? # => true
Источник — «http://www.wiki.crossplatform.ru/index.php/Ruby/Hash/clear»