If you don't have types you still might not know what to pass in. I mean if it says function( id, filePath, newStudent) is id a number or a string. Or say filePath perhaps you have a defined class for that instead of passing in a string. Sure you could write it as function( idNumber, filePathString, newStudentClass) but you're just reimplemting types as a naming scheme that isn't able to be checked compile time.
