kconner

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

ttesmer

{-# LANGUAGE TypeSynonymInstances #-}
data Dual d = D Float d deriving Show
type Float' = Float

diff :: (Dual Float' -> Dual Float') -> Float -> Float'
diff f x = y'
  where D y y' = f (D x 1)

class VectorSpace v where
  zero  :: v

Snawoot

Poor Man's Global Traffic Manager

Sometimes we need to add redundancy to some service or server which happen to be a public-facing entry point of our infrastructure. For example, imagine we want to add a high availability pair for a load balancer which sits on the edge of network and forwards traffic to alive backend servers.

                                             ┌─────────────┐
                                             │             │
                                      ┌─────►│  Backend 1  │
                                      │      │             │
                                      │      └─────────────┘

AnomalRoil

# to add to your ~/.bashrc or your ~/.zshrc file. Usage: $ go switch 1.18.1
function go() {
  case $* in
    switch* )
        shift 1
        gobindir=$(go env GOBIN)
        # adapt to a valid directory at the beginning of your $PATH if you're not on systemd
        homebindir=$(systemd-path user-binaries)
        go install golang.org/dl/go"$@"@latest
        $gobindir/go"$@" download

mdegat01

blueprint:
  name: Update notifications
  description: Send notifications for new updates and install or skip on action
  homeassistant:
    min_version: '2022.4.0'
  domain: automation
  input:
    update_entities:
      name: Update entities
      description: >-

alfonsrv

#!/usr/bin/python3
# -*- coding: utf-8 -*-

# Copyright (c) Rau Systemberatung GmbH (rausys.de)
# MIT License
# credits: https://pyimagesearch.com/start-here/

import argparse
import os
from datetime import datetime, timedelta

bluzky

defmodule DateTimeParser do
  @mapping %{
    "H" => "(?<hour>\\d{2})",
    "I" => "(?<hour12>\\d{2})",
    "M" => "(?<minute>\\d{2})",
    "S" => "(?<second>\\d{2})",
    "d" => "(?<day>\\d{2})",
    "m" => "(?<month>\\d{2})",
    "y" => "(?<year2>\\d{2})",
    "Y" => "(?<year>-?\\d{4})",

PJUllrich

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	O(log n)
Search	O(log n)
Insertion	O(n) for <= 32 elements, O(log n) for > 32 elements [2]
Deletion	O(n) for <= 32 elements, O(log n) for > 32 elements

LeeKahSeng

// MIT License
//
// Copyright (c) 2023 Lee Kah Seng
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

hartescout

## In no particular order. I'm pulling these from a bookmark folder, I'll work on labeling as I have time. Hope these help. Will be mixing in Linux reference as well. 

Sidenote: the macOS Internals series is amazing, although might be out of reach for some. However if having a hard time deciding (I definitely way) and in budget, In my opinion, they are worth the price. I've worked through Volume II, waiting on Volume III. 
As always, most of what we need in our world can be found open sourced and provided by some of the brightest, but it can be a frustrating journey finding material.

https://www.intezer.com/blog/malware-analysis/elf-malware-analysis-101-linux-threats-no-longer-an-afterthought/
http://timetobleed.com/dynamic-linking-elf-vs-mach-o/
https://github.com/apple/darwin-xnu
https://opensource.apple.com/source/xnu/
https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/KernelProgramming/Architecture/Architecture.html