What are 'Arguments'? In programming, arguments are pieces of data which are sent to a function upon calling that function. Arguments can be any standard variable type, this includes types such as 'String', 'Integer' and 'Boolean'. What are 'Parameters'? Parameters (Params) are the pieces of data which are request or required once a function has been called.

What are custom functions? Custom functions are functions which you have made yourself. They can be Private (only the class in which it is created can use it) or Public (any class may use it). They are able to take parameters/arguments, can return data and can be ran on separate threads. When should you use custom functions? Whenever you have a script which needs to be ran over and over again at different positions within your source code you should create one function to contain the script.

The other way to test the data inside a variable is by using a Select case Statements. In visual basic, the Select case statements are just like If statement but with a little difference. For me, the Select Case statement is better and more efficient.