hsh.key(value) â key
Instance Public methods
Returns the key of an occurrence of a given value. If the value is not
found, returns nil.
h = { "a" => 100, "b" => 200, "c" => 300, "d" => 300 }
h.key(200) #=> "b"
h.key(300) #=> "c"
h.key(999) #=> nil
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