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KeyError

        # KeyError < IndexError

(from ruby core)
---
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"
---
# Class methods:

    new

# Instance methods:

    key
    receiver


      

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.