Closures and Higher-Order Functions — Forge College

In this lesson you will learn to write Rust closures and higher-order functions that capture environment values safely, obey ownership and borrowing rules, and compose into reusable pipelines — all demonstrated with small, runnable examples that highlight real compiler behavior.

This lesson appears in the Programming with Solana track as part of the Introduction to Rust for Solana course and belongs to the module Functional Programming in Rust and Understanding Lifetimes. It follows earlier functional composition work and shows how closures become the practical building blocks you pass, return, and compose without plumbing extra parameters.

Topics covered
- Closure capture modes: capturing by reference, by mutable reference, and by value, and how each affects ownership and borrowing
- Closure traits and inference: when closures implement Fn, FnMut, or FnOnce and how the compiler chooses a trait
- Passing closures as arguments: generic function parameters, trait bounds, and boxed trait objects for runtime dispatch
- Composing closures into pipelines: building small adapters and combining closures for reuse and testability
- Practical lifetime and borrowing considerations when closures capture or move values in Solana programs

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

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