␡
- The Class Hierarchy
- Creating a New Class
- Declaration and Instantiation
- Constructors and Destructors
- Garbage Collection
- Inheritance
- Object Operators
- Adding and Overriding Methods
- Calling the Overridden Method
- Overloading
- Casting
- Oddities
- Encapsulation
- Access Scope: Public, Private, Protected
- Setting Properties with Methods
- Default and Optional Parameters
- Declaring Variables Static and Const
- Revisiting the StringParser Module
- Example: Creating a Properties Class
- Data-Oriented Classes and Visual Basic Data Types
- Advanced Techniques
This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
Default and Optional Parameters
Optional parameters are really just shortcuts to overloading methods. There are two ways to indicate that a parameter is optional. The obvious way is to use the Optional keyword, like so:
aMethod(aString as String, Optional anInteger as Integer)
The second way is to establish a default value for one of the parameters. Another way to accomplish what I just did in the previous example is this:
aMethod(aString as String, anInteger as Integer = 100)
Really, the Optional keyword just sets a default value of "0" to the anInteger variable, so the only real difference is that you get to set an arbitrary default value when using the second approach.