When I run the following, rescue seems to be ignored for ArgumentError. The ArgumentError error message from Ruby appears on the console, but my puts message does not. I tried rescue with TypeError and ZeroDivisionError, and it worked.
def divide(a, b)
begin
a.to_s + ' divided by ' + b.to_s + ' is ' + (a/b).to_s
rescue ArgumentError
puts 'there must be two arguments'
end
end
divide(4)
The exception is not thrown inside the function, but at the point where it is called, so you need to catch it somewhere else:
def divide(a, b)
a.to_s + ' divided by ' + b.to_s + ' is ' + (a/b).to_s
end
begin
divide(4)
rescue ArgumentError
puts 'there must be two arguments'
end
While that works, catching ArgumentError is a very bad idea, as it indicates an error in your code which you shouldn't be able to recover from.
The rescue-ing will be done for this part of code : a.to_s + ' divided by ' + b.to_s + ' is ' + (a/b).to_s. Your exception is triggered not in the method, but at calling-time, if you see what I mean.
