"rust""systems-programming""performance"
9 min readRust Closures: When JavaScript's `() => {}` Grew Up and Got a PhD 🦀🔒
Coming from 7 years of JavaScript callbacks and PHP anonymous functions, I thought I knew closures. Then Rust handed me Fn, FnMut, and FnOnce and my brain quietly rebooted. Here's the closure guide I wish I had.
Feb 18, 2026