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latkin /
Last active January 21, 2023 21:29
JNI Object Lifetimes Quick Reference
JNI Object Use across JNI calls? Use on different thread? Notes
latkin / regexinfo.ps1
Last active April 1, 2022 01:43
Regex matching helper
View regexinfo.ps1
Dumps capture group locations and names/numbers
> regexinfo 'Jenny: 555-867-5309' '(?<name>\w+):\s+(?<phone>(?:(?<area>\d{3})-)?(\d{3}-\d{4}))'
[Jenny]: [[555]-[867-5309]]
| || |
| || 1
| |area
| phone
latkin / NativeMethods.fs
Created February 22, 2016 19:46
F# p/invoke example with structs
View NativeMethods.fs
namespace Test
open System.Runtime.InteropServices
// F# implementation of
module NativeMethods =
type ResourceScope =
| Connected = 0x1u
| GlobalNet = 0x2u
latkin / code.fsx
Last active November 13, 2019 09:06
Seq perf
View code.fsx
open System
open System.Collections
open System.Collections.Generic
open System.Diagnostics
open System.Linq
module Algos =
// non-lazy solutions
latkin / func.ps1
Created October 14, 2017 05:22
PowerShell engine stack overflow
View func.ps1
# dot-source this function and try running `f 0`
# It work on Windows in Windows PowerShell and PowerShell Core
# On Mac the powershell process terminates with `Process is terminating due to StackOverflowException. Abort trap: 6`
# programmatically generated by parsing
function f { param($codepoint)
if(($codepoint -ge 0x0000) -and ($codepoint -le 0x0008)){ 'CM' }
elseif($codepoint -eq 0x0009) { 'BA' }
elseif($codepoint -eq 0x000A) { 'LF' }
elseif(($codepoint -ge 0x000B) -and ($codepoint -le 0x000C)){ 'BK' }
latkin /
Created September 9, 2017 22:40

Keybase proof

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latkin /
Last active July 13, 2017 23:02
Ripgrep v git grep speed comparison


// OS
OS Name:                   Microsoft Windows 10 Pro
OS Version:                10.0.15063 N/A Build 15063
System Manufacturer:       Apple Inc.
System Model:              MacBookPro11,5
System Type:               x64-based PC
Processor(s):              1 Processor(s) Installed.
latkin / benchmark.ps1
Created August 2, 2016 02:58
Benchmark of PowerShell de-duplication cmdlets
View benchmark.ps1
# Benchmarking code used to produce results from blog post
# home-grown HashSet-based approach
function hashunique {
[Parameter(Mandatory=$true, ValueFromPipeline = $true)]
[Object[]] $InputObject
latkin /
Last active March 31, 2016 21:39
How to extend a 3rd-party API with F# units of measure

Extending a 3rd-party API with F# units of measure

F# units of measure are nice, but what if I'm using a 3rd-party library which doesn't support UOM? I don't want to re-implement the library, but it would be nice to add the extra safety afforded by UOM. Can I somehow annotate the APIs of the 3rd party library with units?


How to do it

Say you have some unit-free external library like this, which you can't modify:

latkin / TestResults.xml
Created February 16, 2016 05:38
FCS test failures
View TestResults.xml
<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!--This file represents the results of running a test suite-->
<test-results name="C:\src\FSharp.Compiler.Service\bin\v4.0\FSharp.Compiler.Service.Tests.dll" total="373" errors="2" failures="14" not-run="8" inconclusive="0" ignored="8" skipped="0" invalid="0" date="2016-02-15" time="21:36:11">
<environment nunit-version="" clr-version="2.0.50727.8670" os-version="Microsoft Windows NT 6.2.9200.0" platform="Win32NT" cwd="C:\src\FSharp.Compiler.Service" machine-name="LINCOLN-PC" user="lincoln" user-domain="LINCOLN-PC" />
<culture-info current-culture="en-US" current-uiculture="en-US" />
<test-suite type="Test Project" name="" executed="True" result="Failure" success="False" time="112.439" asserts="0">
<test-suite type="Assembly" name="C:\src\FSharp.Compiler.Service\bin\v4.0\FSharp.Compiler.Service.Tests.dll" executed="True" result="Success" success="True" time="52.240" asserts="0">