dan-null

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

dan-null

package main

import (
	"code.google.com/p/go.crypto/pbkdf2"
	"crypto/aes"
	"crypto/cipher"
	"crypto/sha1"
	"database/sql"
	"fmt"
	"log"

dan-null

adb help // List all comands

== Adb Server
adb kill-server
adb start-server 

== Adb Reboot
adb reboot
adb reboot recovery 
adb reboot-bootloader

dan-null

/**
 * An [Observer] for [Event]s, simplifying the pattern of checking if the [Event]'s content has
 * already been handled.
 *
 * [onEventUnhandledContent] is *only* called if the [Event]'s contents has not been handled.
 */
class EventObserver<T>(private val onEventUnhandledContent: (T) -> Unit) : Observer<Event<T>> {
    override fun onChanged(event: Event<T>?) {
        event?.getContentIfNotHandled()?.let { value ->
            onEventUnhandledContent(value)

dan-null

Gist title: "BASH: ISO 8601 Timestamp with Milliseconds"

Summary: How to get an ISO 8601 timestamp with milliseconds in BASH

dan-null

/*
                 _____                __                 
                /__   \__      _____ / _\_   _ _ __ ___  
                  / /\/\ \ /\ / / _ \\ \| | | | '_ ` _ \ 
                 / /    \ V  V / (_) |\ \ |_| | | | | | |
                 \/      \_/\_/ \___/\__/\__,_|_| |_| |_|
                            Coded by errorseven @ 1/26/17

The two sum problem is a common interview question, and it is a variation of the
subset sum problem. There is a popular dynamic programming solution for the