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class · Ruby 4.0
KeyError
Raised when the specified key is not found. It is a subclass of IndexError.
Example
h = {"foo" => :bar} h.fetch("foo") #=> :bar h.fetch("baz") #=> KeyError: key not found: "baz"
Raised when the specified key is not found. It is a subclass of IndexError.
h = {"foo" => :bar} h.fetch("foo") #=> :bar h.fetch("baz") #=> KeyError: key not found: "baz"