Ruby rescue clause is used along with begin and end to define blocks of code to handle exceptions. For example:
begin puts 10 / 0 # w ww .jav a 2s. co m rescue puts "You caused an error!" end
Here, begin...end defines a section where if an exception arises, it's handled with the code inside the rescue block.
Ten divided by zero raises an exception of class ZeroDivisionError.
Being inside a block containing a rescue section means that the exception is handled by the code inside that rescue section.
Rather than existing with a ZeroDivisionError, the text "You caused an error!" is printed to the screen.