Sebastian Herrmann herrherrmann

Useful Tools and Resources

Ubuntu

Ubuntu
Ubuntu is a popular Linux distribution for desktops, servers, and cloud computing, known for its ease of use and robust community support.

Toshy

Toshy
Toshy is a tool that remaps keyboard shortcuts on Linux to make them similar to MacOS, facilitating a smoother transition for Mac users.

How to use

In iTerm2, in the menu bar go to Scripts > Manage > New Python Script

Select Basic. Select Long-Running Daemon

Give the script a decent name (I chose auto_dark_mode.py)

Save and open the script in your editor of choice.

Quick Tips for Fast Code on the JVM

I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information. It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic. So… here's my word of mouth.

This is by no means a comprehensive gist. It's also important to understand that the techniques that I outline in here are not 100% absolute either. Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient. Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact. JMH, Java Flight Recorder, and a good profiler are your very best friend! Mea

async/await is just the do-notation of the Promise monad

CertSimple just wrote a blog post arguing ES2017's async/await was the best thing to happen with JavaScript. I wholeheartedly agree.

In short, one of the (few?) good things about JavaScript used to be how well it handled asynchronous requests. This was mostly thanks to its Scheme-inherited implementation of functions and closures. That, though, was also one of its worst faults, because it led to the "callback hell", an seemingly unavoidable pattern that made highly asynchronous JS code almost unreadable. Many solutions attempted to solve that, but most failed. Promises almost did it, but failed too. Finally, async/await is here and, combined with Promises, it solves the problem for good. On this post, I'll explain why that is the case and trace a link between promises, async/await, the do-notation and monads.

First, let's illustrate the 3 styles by implementing

	// dm Klopapier Widget
	//
	// Copyright (C) 2020 by marco79 <[email protected]>
	//
	// Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted.
	//
	// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
	// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
	// IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE

	import { useLayoutEffect, useCallback, useState } from 'react'

	export const useRect = (ref) => {
	const [rect, setRect] = useState(getRect(ref ? ref.current : null))

	const handleResize = useCallback(() => {
	if (!ref.current) {
	return
	}

	/**
	* @usage:
	*
	* <RadioBox label="Foo" value="foo" v-model="MySelectedValue" />
	* <RadioBox label="Bar" value="bar" v-model="MySelectedValue" />
	* <RadioBox label="Baz" value="baz" v-model="MySelectedValue" />
	*
	* data(){
	* return {
	* MySelectedValue: "",

	#!/bin/bash

	set -e

	CONTENTS=$(tesseract -c language_model_penalty_non_dict_word=0.8 --tessdata-dir /usr/local/share/tessdata/ "$1" stdout -l eng \| xml esc)

	hex=$((cat <<EOF
	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">

	/**************************\
	Basic Modal Styles
	\**************************/

	.modal {
	font-family: -apple-system,BlinkMacSystemFont,avenir next,avenir,helvetica neue,helvetica,ubuntu,roboto,noto,segoe ui,arial,sans-serif;
	}

	.modal__overlay {
	position: fixed;

	// The following example POSTS data to mailthis.to, redirects the user to a confirmation page, and then sends an email (upon the successful completion of Recaptcha verification)

	$.post('https://mailthis.to/[email protected]', {
	email: '[email protected]',
	_subject: 'hi!',
	message: 'Test'
	}).then(function () {
	location.href = 'https://mailthis.to/confirm'
	});