asaaki

/*


    IMPORTANT NOTE: It is not a good idea to use this pattern in production code!


*/

// Q&D way of catching all errors without worrying about their types at compile time
// @see https://doc.rust-lang.org/stable/rust-by-example/error/multiple_error_types/boxing_errors.html

asaaki

#!/usr/bin/env ruby
# gem install benchmark-ips
require 'benchmark'
require 'benchmark/ips'

# https://github.com/evanphx/benchmark-ips#custom-suite
class GCSuite
  def warming(*); run_gc; end
  def running(*); run_gc; end
  def warmup_stats(*); end

asaaki

// Recursion: TCO (Tail Call Optimization)
// Computerphile: https://www.youtube.com/watch?v=_JtPhF8MshA

fn fib(n: usize) -> usize {
    fib_go(n, 0, 1)
}

fn fib_go(n: usize, a: usize, b: usize) -> usize {
    match (n, a, b) {
        (0, v, _) => return v,

asaaki

(Forked fork, that works on macos, too)

Makes little scrolly text jiffs in Flywheel colors.

Prerequisites

• macos: brew install fontconfig imagemagick gifsicle
• Linux: sudo apt install fontconfig imagemagick gifsicle

Usage

asaaki

# frozen_string_literal: true
source 'https://rubygems.org'

gem 'puma'
gem 'sinatra'
gem 'sinatra-contrib'

asaaki

Boolean Environment Variables

Don't overcomplicate things.

I've seen a lot of parse the env var and match it against some known values like:

env_var = ENV['FEATURE_ONE']
case env_var.to_s.downcase
when 'true', 't', 'yes', 'y', 'on', '1' then true

asaaki

[*('A'..'Z'), *('a'..'z')].map do |c|
  puts [c, eval("%#{c}(ls)")].inspect
rescue Exception
  puts "#{c} not allowed"
end; 0

asaaki

### Experiments

# https://ruby-doc.org/core-2.5.0/SizedQueue.html
log = SizedQueue.new(100)
# https://ruby-doc.org/core-2.5.0/Queue.html
queue = Queue.new
# https://ruby-doc.org/core-2.5.0/ThreadGroup.html
group = ThreadGroup.new # pool
5.times do |i|
  # https://ruby-doc.org/core-2.5.0/Thread.html

asaaki

#include <Adafruit_NeoPixel.h>
#include <avr/power.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>

#define STRIP_PIN 6
#define TRIGGER_PIN 2
#define CONTROL_LED 13

// Note: this duration should be also longer than the HIGH time of the PIR

asaaki

#!/bin/sh

targets=(armv7-unknown-linux-musleabihf thumbv7em-none-eabi armv7-unknown-linux-musleabihf)
toolchains=(stable beta nightly)

for toolchain in $toolchains; do
  for target in $targets; do
    echo "--> toolchain $toolchain and target $target"
    rustup target install $target --toolchain $toolchain
    # rustup target remove $target --toolchain $toolchain