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Functional Rustλ

Intermediate→Advanced

Rust 1.94

Master closures, iterators, combinators, and functional programming patterns in Rust — from capture semantics to async closures.

6

Sections

17

Lessons

27

Challenges

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17 lessons and 27 challenges, all 100% free.

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The Three Closure Traits

Move Closures and Borrowing

Precise Closure Capturing

Identifying FnOnce Closures(Sign in required)

Beginner+10 Mana

Closure Inference(Sign in required)

Intermediate+10 Mana

Closure Trait Hierarchy(Sign in required)

Intermediate+20 Mana

Move with Copy Types(Sign in required)

Intermediate+20 Mana

Disjoint Field Capture(Sign in required)

Intermediate+20 Mana

Chaining Iterator Adapters

Implementing Custom Iterators

New Iterator Methods in Recent Rust

Lazy Evaluation(Sign in required)

Intermediate+10 Mana

Iterator Consumer Methods(Sign in required)

Beginner+10 Mana

Lazy Iterator Behavior(Sign in required)

Beginner+10 Mana

Building an Iterator Pipeline(Sign in required)

Intermediate+20 Mana

Vec::extract_if Behavior(Sign in required)

Intermediate+20 Mana

Option Combinators

Result Combinators

Advanced ? Operator Patterns

Unwrap Or Else Benefit(Sign in required)

Intermediate+10 Mana

and_then vs map(Sign in required)

Beginner+10 Mana

Option & Result Combinator Purposes(Sign in required)

Intermediate+20 Mana

The ? Operator(Sign in required)

Intermediate+20 Mana

Collecting Results from Iterators(Sign in required)

Intermediate+20 Mana

Cow: Clone on Write

Immutability Patterns

Cow Borrowed vs Owned(Sign in required)

Intermediate+10 Mana

Functional Composition Patterns

Cow Into Owned(Sign in required)

Intermediate+10 Mana

When Does Cow Clone?(Sign in required)

Beginner+10 Mana

Cow::into_owned Behavior(Sign in required)

Beginner+10 Mana

Builder Pattern Steps(Sign in required)

Intermediate+20 Mana

Immutability Benefits(Sign in required)

Advanced+30 Mana

The HKT Problem

The Family Pattern

HKT Limitation(Sign in required)

Advanced+10 Mana

GAT Help(Sign in required)

Async Closures in Rust

AsyncFn Traits and Bounds

Async Iterator Patterns

Async Closure Syntax(Sign in required)

Beginner+10 Mana

AsyncFn Trait Hierarchy(Sign in required)

Intermediate+20 Mana

Async Closure Advantage(Sign in required)

Intermediate+20 Mana

Concurrent Stream Processing(Sign in required)

Advanced+30 Mana

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17 interactive lessons and 27 hands-on challenges — learn in VS Code, Cursor, or the web.