ggorlen

A half-hour to learn Zig

This is inspired by https://fasterthanli.me/blog/2020/a-half-hour-to-learn-rust/

Basics

the command zig run my_code.zig will compile and immediately run your Zig program. Each of these cells contains a zig program that you can try to run (some of them contain compile-time errors that you can comment out to play with)

Run shell script on gist

Shells that support process substitution such as bash and zsh allow to run shell script on gist as follows.

# With curl:
bash <(curl -sL ${GIST_URL}) args...

# With wget:

So you want to modify the text of a PDF by hand...

If you, like me, resent every dollar spent on commercial PDF tools, you might want to know how to change the text content of a PDF without having to pay for Adobe Acrobat or another PDF tool. I didn't see an obvious open-source tool that lets you dig into PDF internals, but I did discover a few useful facts about how PDFs are structured that I think may prove useful to others (or myself) in the future. They are recorded here. They are surely not universally applicable --
the PDF standard is truly Byzantine -- but they worked for my case.

ARMlite simulator

The ARMlite simulator is a web-based simulator of a 32-bit 'ARM-like' processor and Instruction Set Architecture (ISA), developed by Peter Higginson and Richard Pawson for teaching Computer Science (CS) principles and Assembly Language. It is targetted particularly towards the AQA A-level computing syllabus. It is exceptionally user-friendly and fast, and great fun to experiment with!

Free online student textbook on the topic:
[1] Richard Pawson (with Peter Higginson), Computer Science from the Metal Up - Assembly Language Programming, v1.0.0, 2020
https://peterhigginson.co.uk/ARMlite/Assembly%20Language%20-%20Student%20version.pdf

Online simulator for the ARMlite ISA here:
https://www.peterhigginson.co.uk/ARMlite/

A brief example on how to use npx to run gist based scripts.

Read the article here https://neutrondev.com/npm-vs-npx-whats-the-difference/ or watch it on YouTube https://www.youtube.com/watch?v=fSHWc8RTJug

	from django.contrib.auth import REDIRECT_FIELD_NAME
	from django.shortcuts import render, resolve_url
	from myapp.settings import cfg
	from myapp import settings
	from urllib.parse import urlparse

	import uuid


	def login_is_required(

	# coding: utf-8

	module Tio
	def self.languages
	require 'json'
	JSON.load(Net::HTTP.get(URI('https://tio.run/languages.json'))).keys
	end

	def self.run_url
	URI('https://tio.run/cgi-bin/run/api/')

	#include <stdio.h>

	static char game[8][8] = {
	"nbrnnnnr",
	"rbnn n n",
	"bnnnrbb ",
	"rnrkknnb",
	"rbrkk n ",
	"bnn r n",
	"nnnnn bn",

	const express = require('express');
	const htm = require('htm');
	const vhtml = require('vhtml');

	// create an html`` tag function for vhtml:
	const html = htm.bind(vhtml);

	const App = (props) => html`
	<div class="app">
	<h1>This is an app</h1>