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Exception: KeyError

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
Instance Chain:
Inherits: IndexError
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"

Class Method Summary

::Exception - Inherited

.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.

Instance Method Summary

::Exception - Inherited

#==

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).

Constructor Details

This class inherits a constructor from Exception