Exception: KeyError

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, ::IndexError, ::StandardError, ::Exception
Instance Chain: self, ::IndexError, ::StandardError, ::Exception
Inherits:	IndexError ::Object Exception StandardError IndexError KeyError
Defined in:	error.c, error.c

Overview

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"

.exception	With no argument, or if the argument is the same as the receiver, return the receiver.
.new	Construct a new ::Exception object, optionally passing in a message.

#==	Equality—If obj is not an ::Exception, returns `false`.
#backtrace	Returns any backtrace associated with the exception.
#backtrace_locations	Returns any backtrace associated with the exception.
#cause	Returns the previous exception ($!) at the time this exception was raised.
#exception	With no argument, or if the argument is the same as the receiver, return the receiver.
#inspect	Return this exception's class name and message.
#message	Returns the result of invoking `exception.to_s`.
#set_backtrace	Sets the backtrace information associated with `exc`.
#to_s	Returns exception's message (or the name of the exception if no message is set).

This class inherits a constructor from Exception