harmenjanssen’s gists

harmenjanssen / nearest-vowels.clj

Created May 5, 2020 07:17

nearest-vowels Clojure kata

	(def vowels "aeiou")

	(defn is-vowel [ch] (not (nil? (some #{ch} vowels))))

	(defn abs [n] (max n (- n)))

	(defn distance
	"Returns the distance from the number x to the closest number in xs"
	[xs x]
	(apply min (map (fn [y] (abs (- y x))) xs)))

harmenjanssen / index.html

Created May 27, 2019 06:14

Wrap JS-dependent elements in a `<template>`, and simply unwrap at runtime.

	<!doctype html>
	<title>Hello</title>
	<p>The following search field depends on Javascript, so let's render it with Javascript:

	<template data-autorender="true">
	<form>
	<input type="search">
	</form>
	</template>

harmenjanssen / example1.php

Last active May 10, 2019 09:40

Quick example of how Maybe could work in PHP.

	<?php
	$record = $model->fetchById(42); // return Maybe(Record)
	$related = $record->map(function ($record) {
	// If this function is executed, record is definitely available, no need to check.
	return $otherModel->fetchWhere('foreign_key', $record->id);
	});

	// It's still a Maybe after mapping, so you can continue mapping on the value.
	// If the first fetchById call got you a Nothing, this is still the same
	// Nothing, but your code doesn't need to know, it can be written

harmenjanssen / .env.template

Created March 26, 2019 15:27

Create a redirect programmatically in a website-configured S3 bucket.

	AWS_ACCESS_KEY_ID=
	AWS_SECRET_ACCESS_KEY=
	AWS_REGION=
	AWS_S3_BUCKET=
	AWS_BUCKET_WEBSITE_URL=

harmenjanssen / middle_char.php

Last active July 29, 2018 07:33

Recursive function for grabbing the middle character (or 2) of a string.

	<?php
	function middle_char(string $str): string {
	return strlen($str) <= 2
	? $str
	: middle_char(substr($str, 1, -1));
	}

harmenjanssen / my_test.php

Created March 27, 2018 20:48

Use `@dataProvider` to quickly pass a bunch of invalid input through your function to make sure it fails correctly.

	<?php
	use PHPUnit\Framework\TestCase;

	class MyTest extends TestCase {
	/**
	* @dataProvider invalidArgumentProvider
	* @expectedException InvalidArgumentException
	*/
	public function test_should_throw_on_invalid_arguments($arg) {
	my_func($arg);

harmenjanssen / app.js

Created September 20, 2017 20:21

Struggling with "carrying over" arguments in a function composition. In the example I would like the final `assoc` call in the composition to end up knowing about both the page's URL property and the menuItem object.

	import { pages, menuItems } from "./data.js";
	import { propEquals, prop, assoc, compose, map } from "./util.js";

	const findPageById = id => pages.find(propEquals("id", id));

	// Put a "url" property on the menuItems, taken from the related Page
	console.log(
	map(
	compose(
	assoc(

harmenjanssen / curry.js

Last active September 20, 2017 20:02

	/**
	* Ha! I totally fucked up. I noticed after publishing this, so instead of quietly updating this I will
	* add a bit of educational text.
	*
	* The function below, curry_bodged, makes the mistake of saving the args in lexical scope, resulting in
	* an ever-expanding list of arguments. Every time you call the curried function the arguments are added to
	* the same list, and the actual applied function will probably re-use the same arguments from the first time.
	*
	* Example with the `addThree` function below:
	* addThree(1, 2, 3) // 6, args = [1, 2, 3]

harmenjanssen / helpers.js

Last active September 12, 2017 21:52

`prop` and `propIn` utility functions using the Maybe monad.

	// maybe :: ?a -> Maybe a
	export const maybe = x => {
	return x != null && x !== undefined ? Just(x) : Nothing;
	};

	// identity :: a -> a
	export const identity = x => x;

	// prop :: String -> Object -> Maybe x
	export const prop = x => o => maybe(o[x]);

harmenjanssen / Plugin.php

Created August 30, 2017 14:44

Javascript fallback for broken default values in OctoberCMS' Repeater fields

	<?php
	class Plugin extends PluginBase
	{
	public function boot()
	{
	Event::listen('backend.page.beforeDisplay', function($controller, $action, $params) {
	$controller->addJs('/plugins/grrr/flexiblepages/assets/javascript/repeater.js');
	});
	}
	}

Harmen Janssen harmenjanssen