An introduction to closures in Rust - anonymous functions that capture their environment, how they differ from named functions, and when to use them.

• Capturing The Environment With Closures
• Closures That Borrow And That Steal Move Closures
• Function And Closure Types
• Closures And Safety
• Using Closures Effectively
• Callbacks
• Closure Performance

A thorough recap of Rust iterators and how closures power iterator adapters, with a deep look at lazy evaluation and zero-cost abstractions.

• Iterator Adapters And Closures
• Laziness And Zerocost Abstractions