F# · Expert

Lesson 1 · On the house

MailboxProcessor agents

Actor-style state with MailboxProcessor, Post, PostAndReply, and message DUs.

Lesson 2

Full computation expression builders

Delay, Zero, Combine, For, and Yield to support loops and sequencing in your own CE.

Lesson 3

Statically resolved type parameters

Member constraints with inline and ^T to call members on any type that has them.

Lesson 4

Quotations

Capture code as data with <@ @>, inspect it with patterns, and evaluate simple trees.

Lesson 5

FSharp.Reflection

Inspect union cases and record fields at runtime to build generic printers and serializers.

Lesson 6

Parser combinators from scratch

Build small parsers as functions and combine them with map, bind, and choice.

Lesson 7

Continuation-passing style

Make non-tail recursion stack-safe by passing the rest of the work as a function.

Lesson 8

Structs and performance

[<Struct>] records and unions, ValueOption, inline, and avoiding allocations.

Lesson 9

Events and observables

Event<_>, Publish, Trigger, and composing streams with the Observable module.

Lesson 10

.NET interop and nulls

Handle nulls at the boundary, use .NET collections, out parameters, and attributes.