Object Design Style Guide

Appendix: Coding standard for the code samples

The programming language used for the code samples in this book is a generalized object-oriented programming language. Its syntax is a mix of PHP and Java. It has the following properties:

• It’s strictly typed. Parameters and return values need explicit return types:

   public function foo(Bar bar): Baz
   {
       // returns an instance of `Baz`
   }

• Parameters, properties, and return types can allow for null as a value by adding a question mark at the end:

   public function foo(Bar? bar): Baz?
   {
       // allow in instance of `Bar`, or `null`
  
       // returns an instance of `Baz`, or `null`
   }

• If you don’t add a question mark after a parameter or return value’s type, null will not be an accepted value for it:

   public ...