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Justin Heyes-Jones justinhj

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@justinhj
justinhj / middleearth.ts
Created March 7, 2024 23:34
Weird use of Omit
type Species = 'hobbit' | 'orc' | 'elf' | 'man';
interface MiddleEarthDenizen {
name: string
species: Species
}
interface Hobbit extends Omit<MiddleEarthDenizen, 'species'> {
burrow: string
species: 'hobbit'
@justinhj
justinhj / main.cpp
Created October 7, 2023 03:10
leetcode.com/problems/multiply-strings
#include <iostream>
#include <vector>
#include <ranges>
#include <algorithm>
using namespace std;
class Solution {
public:
string m2(string num1, int multiplier, int zeros) {
@justinhj
justinhj / howto.txt
Last active August 23, 2021 04:56
How to do Rust on Windows with Gnu tools
Follow these instructions after you have Rustup, Scoopy and cmder installed.
https://jrhawley.ca/2020/05/25/rust-toolchain-windows
One extra bit of info is to set the path in cmder follow these instructions
https://jonathansoma.com/lede/foundations-2019/terminal/adding-to-your-path-cmder-win/
Find msys in the scoop folder and add the path, mine was here...
@justinhj
justinhj / gist:a651e9819bc9bad56e7c57f5f6f83895
Created May 15, 2021 08:27
globalwordfreq.txt
Found 546487 words in the book
Words with the most uncommon occurence in the English words found on the web
See https://www.kaggle.com/rtatman/english-word-frequency
sibilance (12720)
hubristic (12760)
hellishly (12784)
jerkily (12785)
antimissile (12799)
mildews (12801)
@justinhj
justinhj / Scala2WriterTWithCats.scala
Created March 1, 2021 19:45
package org.justinhj
object Scala2WriterTWithCats extends App {
// Implement WriterT using Cats implementation of Monad and Monoids
import cats.{Monad, Monoid}
case class WriterT[F[_]: Monad,W,A](val wrapped: F[(W,A)])
@justinhj
justinhj / WriterTTest.scala
Last active January 29, 2021 02:01
Scala 3 WriterT
object WriterTest extends App {
trait Semigroup[A]:
def combine(al: A, ar: A): A
object Semigroup:
def apply[A](using s: Semigroup[A]) = s
trait Monoid[A] extends Semigroup[A]:
def zero: A
@justinhj
justinhj / WriterTOldSchool.scala
Last active January 27, 2021 23:44
Implementation of the WriterT monad transformer leveraging Cats for Monad and Monoid
package org.justinhj
object WriterTOldSchool extends App {
import cats.{Monad, Monoid}
case class WriterT[F[_]: Monad,W,A](val wrapped: F[(W,A)])
implicit def writerTMonad[F[_]: Monad,W: Monoid] = new Monad[WriterT[F,W,?]] {
@justinhj
justinhj / Scala3DefaultOptionMacro.scala
Created January 25, 2021 18:23
Macro that crashes the compiler
// Macro that crashes the compiler
import scala.quoted._
def takeOptionImpl[T](o: Expr[Option[T]], default: Expr[T])(using Quotes, Type[T]): Expr[T] = '{
$o match {
case Some(t1) => t1
case None: Option[T] => $default
}
}
@justinhj
justinhj / MultipleSameLayerZio1.scala
Created December 6, 2020 18:11
How to have multiple of the same ZLayer
object Temp {
final case class Person(name: String, age: Int)
case class Person2(p: Person)
val personLayer = ZLayer.succeed(Person("Nero", 4))
val ageLayer = personLayer.project(_.age)
val person2Layer = ZLayer.succeed(Person2(Person("Nero2", 8)))
val p = (for (
@justinhj
justinhj / Life.scala
Created September 17, 2020 00:41
def play(gridStr: String): String = {
val grid = convertStringToGrid(gridStr)
val newG = grid.zipWithIndex.map {
case (row, x) =>
row.zipWithIndex.map {
case (col, y) => {
val count = countNeighbours(grid, x, y)
if(count == 2 || count == 3)
true