Checking each argument in a method?

Question

Let's say I have a method that has the following...

def is_number?(a,b,c,d)
  # ... check if the argument is a number
end

Is it possible to iterate through each argument passed to is_number? and do what is within the method?

For example...

is_number?(1,3,"hello",5)

Would go through each argument and if the argument each argument is a number it would return true, but in this case, it would return false due to "hello".

I already know how to check if an input is a number, I just want to be able to check numerous arguments all in one method.

Answer 1

Code golfing sawa's answer: same length, but avoids |

def is_number?(*args)
  (args - args.grep(Fixnum)).empty?
end

is_number?(1,2,3) # => true
is_number?(5,2,"foo") # => false

It'd be nice if there was a grep -v , but currently there isn't one.

Answer 2

def is_number? *args; args.all?{|a| a.kind_of?(Fixnum)} end

Replace Fixnum if you want a different class to match.