class
ArgumentError
ruby latest stable
- Superclass: StandardError
Raised when the arguments are wrong and there isn’t a more specific Exception class.
Ex: passing the wrong number of arguments
[1, 2, 3].first(4, 5)
raises the exception:
ArgumentError: wrong number of arguments (given 2, expected 1)
Ex: passing an argument that is not acceptable:
[1, 2, 3].first(-4)
raises the exception:
ArgumentError: negative array size
Files
- error.c
1Note
Use this!
You should raise your own +ArgumentError+ in methods to notify users of your class, if you think certain kinds of arguments aren't acceptable.
def transfer_money(amount)
unless amount.is_a?(Number)
raise ArgumentError.new("Only numbers are allowed")
end
# ... Do the actual work
end