Rust promotes the creation of reusable code through various language features and best practices. Here's how Rust encourages the development of reusable code:

1. Modules and Crates : Rust provides a module system that allows you to organize code into logical units, called modules. Modules help encapsulate related functionality and provide a clear boundary for code reuse. Multiple modules can be organized into crates, which are Rust's compilation units. Crates can be shared and reused across different projects.

2. Packages and Dependency Management : Rust uses the Cargo build system, which manages packages and their dependencies. Packages are directories containing a `Cargo.toml` file, and they can contain one or more crates. Cargo facilitates easy sharing and distribution of code by allowing developers to publish packages to the central package registry (crates.io) and consume external crates in their projects.

3. Libraries : Rust allows you to create reusable code in the form of libraries. Libraries are crates that expose reusable functionality to other crates. They can be shared across multiple projects, enabling code reuse at a granular level. Rust supports two types of libraries: `lib.rs` (Rust library) and `cdylib.rs` (C-compatible dynamic library). 4. Generic Programming : Rust's support for generics enables you to write code that is parameterized by types. By using generic types and functions, you can create reusable algorithms and data structures that can operate on different types without sacrificing type safety. This promotes code reuse and reduces duplication.

5. Traits : Traits in Rust provide a way to define shared behavior and interfaces. By defining traits, you can specify a set of methods that types can implement, allowing them to be used interchangeably. Traits enable polymorphism and code reuse by providing a common interface for different types, regardless of their specific implementations.

6. Macros : Rust's macro system allows you to define reusable code patterns and generate code at compile time. Macros enable code generation, automation, and metaprogramming, promoting code reuse by reducing boilerplate code and providing expressive abstractions.

7. Documentation and Examples : Rust emphasizes the importance of documentation and examples to facilitate code reuse. By documenting your code with meaningful comments, doc comments, and examples, you make it easier for others to understand and reuse your code. Rust's documentation tool, `rustdoc`, generates documentation from specially formatted comments, which can be published alongside your code for reference.

By combining these features and best practices, Rust enables the creation of reusable code that is expressive, efficient, and safe. The language's focus on memory safety, strong type system, and performance empowers developers to build reusable components and libraries that can be shared, reused, and maintained over time.