Learn Rust in a Month of Lunches

15 Default, the builder pattern, and Deref

This chapter covers

• Using the Default trait
• Using the builder pattern to control how your types are generated
• Using Deref and DerefMut to steal the methods of other types to use in your own

This chapter is a fun one. You’ll learn the builder pattern, which lets you declare variables by chaining method after method instead of writing all the parameters for a struct. It’s especially good for writing code that other people might use because you can control which parts they can touch and which they can’t. The Deref trait that you’ll learn later in the chapter lets you make your own types that hold all the methods of another type for free. This allows you to easily make types that hold someone else’s type ...