Rust Traits and Abstraction for Reusable Functional Code — Forge College

In this lesson you will learn how to name behavior with a Rust trait and design APIs that accept both closures and concrete types without unnecessary cloning or allocation. You implement a Transform behavior, provide a blanket implementation so closures satisfy that trait, and see practical tradeoffs between generic bounds and trait-object designs.

This lesson is part of the Programming with Solana track and the Introduction to Rust for Solana course, inside the module Functional Programming in Rust and Understanding Lifetimes. It follows hands-on work with closures and higher-order functions and prepares you to add lifetime and borrow-semantics reasoning when trait objects or captured environments interact.

Topics covered
- Define a Transform trait with method fn apply(&self, i: i32) returns i32 to name a reusable behavior.
- Provide a blanket impl for any F where F: Fn(i32) returns i32 so closures implement the same trait as structs.
- Write functions that accept generic bounds T: Transform and compare them with APIs that accept Box of dyn Transform.
- Design borrow-friendly signatures that avoid cloning captured environment and decide when generics outperform trait objects for performance and code size.
- A small, compiling module demonstrating a concrete struct and a closure used interchangeably so you can cargo build and test locally.

Full playlist:
https://www.youtube.com/playlist?list=PLjAMVL3818KxgHWvN6C6shmuzzVRHdKw3

Practice these patterns and build projects at https://www.forge.college/

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