Ch13 BoundedChenn31

polytypic / Zio.fsx

Last active January 16, 2023 14:42

Zio like monad in F#

	// Computations with extensible environment, error handling, and asynchronicity

	// I recently reviewed some F# code that turned out to be using
	//
	// Dependency Interpretation
	// https://fsharpforfunandprofit.com/posts/dependencies-4/
	//
	// and got thinking about whether one could construct a usable Zio like monad
	//
	// https://zio.dev/

davidfowl / ConcurrentDictionaryExtensions.cs

Last active January 8, 2026 18:00

	using System;
	using System.Threading.Tasks;

	namespace System.Collections.Concurrent
	{
	public static class ConcurrentDictionaryExtensions
	{
	/// <summary>
	/// Provides an alternative to <see cref="ConcurrentDictionary{TKey, TValue}.GetOrAdd(TKey, Func{TKey, TValue})"/> that disposes values that implement <see cref="IDisposable"/>.
	/// </summary>

atsapura / Srtp and Records.fs

Last active January 4, 2025 05:27


	(*
	WHAT'S GOING ON HERE?!

	Sometimes you don't care about a particular type, you're interested in one field only, let's say `EntityId`.
	Instead of using interface (which isn't even possible if don't own a type),
	we can do structural typing in F# using SRTP and Active Patterns.
	Active patterns are not required for this, but they do make code much easier to use.
	*)
	// So we have 2 types with field `EntityId: string`:

eulerfx / Async.Cache.fs

Last active April 23, 2025 17:36

F# Async Cache

	let cache (a:Async<'a>) : Async<'a> =
	let tcs = TaskCompletionSource<'a>()
	let state = ref 0
	async {
	if (Interlocked.CompareExchange(state, 1, 0) = 0) then
	Async.StartWithContinuations(
	a,
	tcs.SetResult,
	tcs.SetException,
	(fun _ -> tcs.SetCanceled()))