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F# Advent 2021 Dec 08 - Fast data pipelines with F#6

Thanks to Sergey Tihon for running F# Weekly and F# Advent.

Thanks to manofstick for trying out the code and coming with invaluable feedback. Cistern.ValueLinq is very impressive.

TLDR; F#6 enables data pipelines with up to 15x less overhead than LINQ

There were many interesting improvements in F#6 but one in particular caught my eye, the attribute InlineIfLambda.

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F# Advent 2016 (English) - December 10 - Implementing a persistent hash map.

This blog created for F# Advent 2016 (English)

Full source code can be found here

Changelog

1. 2016-12-10
2. New performance test - Anthony Lloyd (@AnthonyLloyd) suggested that I compare against Prime.Vmap.

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Optimizing a simple problem

I was introduced to a simple optimization problem by one of my interns last week. He was about to participate in a friendly competition where they were asked to find a performant solution to the problem:

The problem

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JSON Monadic Transformers

Full source at: https://gist.github.com/mrange/7c39333de480a8de5c812a1f6ba70173

A popular approach in Functional Languages to create parsers is to use parser combinators.

Parser combinators provide a way to compose parser of ever increasing complexity from simple parsers. Parser combinators

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namespace CExprs

module LogoTurtle  =

    type Distance_Unit = STEPS
    type Rotation_Unit = GRADATIONS
    type Rotation_Direction = | LEFT | RIGHT
    let STEP = STEPS
    let GRADATION = GRADATIONS

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open System
open System.IO
open System.Web
open System.Net
open System.Collections.Generic

Environment.CurrentDirectory <- __SOURCE_DIRECTORY__

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# NOTE - If there are weird character errors when trying to load this profile
#   resave the file with the encoding `UTF-8 with BOM`   
 
#   ┌                   ┐
#     Setup Environment
#   └                   ┘

# change to codepage to display symbols properly
chcp 65001 | out-null

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open System.Diagnostics
open System.Reflection
open Microsoft.FSharp.Core
open Microsoft.FSharp.Core.Operators
open Microsoft.FSharp.Core.LanguagePrimitives
open Microsoft.FSharp.Core.LanguagePrimitives.IntrinsicOperators
open Microsoft.FSharp.Collections
open Microsoft.FSharp.Primitives.Basics
open System.Collections.Generic

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#r "../../../packages/fparsec/lib/net40-client/fparseccs.dll"
#r "../../../packages/fparsec/lib/net40-client/fparsec.dll"
open System

Environment.CurrentDirectory <- __SOURCE_DIRECTORY__

open FParsec
open FParsec.Primitives

let (^) = (<|)

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open System
open System.Reflection

type CLIArguments =
    | Working_Directory of string
    | Listener of host:string * port:int
    | Data of byte []
    | Port of int
    | Log_Level of int
    | Detach