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. Programs may subclass Exception to add additional information.
With no argument, or if the argument is the same as the receiver, return the receiver. Otherwise, create a new exception object of the same class as the receiver, but with a message equal to string.to_str.
Construct a new Exception object, optionally passing in a message.
Returns any backtrace associated with the exception. The backtrace is an array of strings, each containing either ``filename:lineNo: in `method’’’ or ``filename:lineNo.’‘
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
With no argument, or if the argument is the same as the receiver, return the receiver. Otherwise, create a new exception object of the same class as the receiver, but with a message equal to string.to_str.
Returns the result of invoking exception.to_s. Normally this returns the exception’s message or name. By supplying a to_str method, exceptions are agreeing to be used where Strings are expected.
Sets the backtrace information associated with exc. The argument must be an array of String objects in the format described in Exception#backtrace.
Returns the result of invoking exception.to_s. Normally this returns the exception’s message or name. By supplying a to_str method, exceptions are agreeing to be used where Strings are expected.