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Design Patterns and Best Practices in Rust
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In this section, we will explore how Factory Method works in Rust. We'll see how Rust's approach to constructors and its powerful type system often provide alternatives that are more idiomatic than traditional Factory Method implementations.
In object-oriented languages, Factory Method encapsulates object creation, hiding instantiation logic and often enabling subclass customization. This is typically achieved through inheritance and virtual methods. Rust doesn't have classes or inheritance, so the pattern adapts: instead of virtual methods that subclasses override, Rust uses associated functions (methods without self) that return concrete types. The encapsulation benefit remains. Callers don't need to know the construction details, but the polymorphism comes from enums and traits rather than inheritance hierarchies.
Let's see how this manifests in our Correct Calculator project, where we need...