Descendents of class Exception
are used to communicate between raise
methods and rescue
statements in begin/end
blocks. Exception
objects carry information about the exception—its type (the exception's class name), an optional descriptive string, and optional traceback information.
def a
raise "boom"
end
def b
a()
end
begin
b()
rescue => detail
print detail.backtrace.join("\n")
end
produces:
prog.rb:2:in `a'
prog.rb:6:in `b'
prog.rb:10
String
objects in the format described in Exception#backtrace
.Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide"
Copyright © 2001 by Addison Wesley Longman, Inc. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/).
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