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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?

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require 'json'
require 'csv'

### This is a function definition; functions are the same kind of thing you
### use in excel, like VLOOKUP - you give them a variable and they do something
### or return some variable; this one is simple, you give it a URL and it
### returns a command to be run in a shell
def make_query(url)
  ### This makes the request to the url you've requested; think about it as a
  ### browser window that does things for you and returns you data / html / etc

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require 'net/http'
require 'json'
require 'csv'

GEFORCE_NOW_GAMES_URL = 'https://static.nvidiagrid.net/supported-public-game-list/gfnpc.json?JSON'
STEAM_GAME_REVIEWS_URL = 'https://store.steampowered.com/appreviews/'
STEAM_GAME_INFO_URL = "https://store.steampowered.com/api/appdetails/?appids="

def query_url(url, params="")
  uri = URI(url + params)

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alias help='cat ~/.oh-my-zsh/custom/aliases.zsh'
alias aliases='vim ~/.oh-my-zsh/custom/aliases.zsh'

if [[ $OSTYPE == darwin* ]]; then
  alias browse="open -a /Applications/Google\ Chrome.app"
  alias wp='cd ~/Documents/Github'
elif [[ $OSTYPE == linux-gnu* ]]; then
  alias wp='cd /mnt/c/Users/Andrea/Documents/Github/'
fi

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# Instructions https://cloud.google.com/ruby/rails/appengine

sudo apt-get remove ruby

sudo apt-get install build-essential

sudo apt-get install -y libssl-dev libreadline-dev zlib1g-dev

git clone https://github.com/rbenv/rbenv.git ~/.rbenv

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pushd $1
find . -type f -print0 | xargs -0 dos2unix
popd

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#!/bin/bash

# Make a PDF look scanned. 
# Extracted from https://github.com/baicunko/scanyourpdf and modified for smaller output files (compression lower density).

# Project requires ImageMagick and GhostScript. This will do the trick on Ubuntu:

# sudo apt-get install ghostscript
# sudo apt-get install imagemagick

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module.exports = {
  projects: [
    {
      displayName: "test",
      setupFiles: [
        "<rootDir>/jest.setup.js"
      ],
      testMatch: [
        "<rootDir>/src/__tests__/*.spec.js"
      ]

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module.exports = function(config) {
  config.set({
    mutator: "javascript",
    packageManager: "npm",
    reporters: ['progress', 'dots'],
    testRunner: 'jest',
    testFramework: 'jest',
    coverageAnalysis: 'off',
    fileLogLevel: 'trace',
    jest: {

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cat text.txt | tr '[:space:]' '[\n*]' | tr -cd "[:alnum:]\n"| tr "[:lower:]" "[:upper:]" | grep -v "^\s*$" | sort | uniq -c | sort -bnr > text.fqr