alessioalex

/*
import express from 'express';
import db from './core/db';

const app = express();
const port = process.env.PORT || 3000;

app.get('/visits', (req, res, next) => {
  db.connect(async ({ query } => {
    await query('INSERT INTO visit (date) VALUES ($1)', new Date());

alessioalex

#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?

alessioalex

var fs = require('fs');
var CHUNK_SIZE = 4 * 1024;
var buffer = new Buffer(CHUNK_SIZE);
var filePath = __dirname + '/public/index.html';

// fs.open(filePath, 'r', function(err, fd) {
//   if (err) throw err;
// 
//   fs.read(fd, buffer, 0, CHUNK_SIZE, null, function(err, nread) {
//     if (err) throw err;

alessioalex

function shortcut(shortcutKeys, callback) {
  var code = shortcutKeys.toString();
  var keys = [];

  document.addEventListener('keydown', function(evt) {
    keys.push(evt.keyCode);
    
    if (keys.length > shortcutKeys.length) {
      keys.shift();
    }

alessioalex

function run(steps, data, done) {
  // our recursion exit strategy:
  // no items left? we're done.
  if (steps.length === 0) {
    return done();
  }

  // get the first item in the array
  var step = steps.shift();

alessioalex

// https://curiosity-driven.org/array-slices#mimicking-array

function emulateArray(obj) {
    var length = obj.length || 0;
    return new Proxy(obj, {
        get: function(target, property) {
            if (property === 'length') {
                return length;
            }
            if (property in target) {

alessioalex

Misc:

• CruciblePlaybook FAQ: https://www.reddit.com/r/CruciblePlaybook/wiki/faq
• General PvP advice (what noobs do / radar / how to win gunfights / subclass builds etc): https://www.reddit.com/r/CruciblePlaybook/comments/3gqp85/things_noobs_do_cover_radar_gunfights_howwhen_to/
  • https://www.reddit.com/r/CruciblePlaybook/comments/46lhhf/re_gameplay_review_moving_knowledgesmarts_skill/
• MTashed Crucible School (general PvP advice): https://www.youtube.com/playlist?list=PLVHacqixRV3Eo83gPpSesKjfkzlFRLwK1
• Making decisions in PvP (text + vid):

alessioalex

var observer = new MutationObserver(function(mutations) {
    //console.log('OBSERVED', mutations);
    var observation = parseInt(Math.random() * 100);
    console.group('Observation ' + observation);
    mutations.forEach(function(mutation) {
        console.log('%s: %s', mutation.target.nodeName, mutation.type, mutation);
    });    
    console.groupEnd();
});
var config = {childList: true, attributes: true, characterData: true, subtree: true, attributeOldValue: true, characterDataOldValue: true};

alessioalex

// http://stackoverflow.com/questions/4787698/failure-to-override-elements-addeventlistener-in-firefox
(function() {
    Error.stackTraceLimit = Infinity;
    
    var _interfaces = Object.getOwnPropertyNames(window).filter(function(i) {
      return /^HTML/.test(i);
    }).map(function(i) {
      return window[i];
    });

alessioalex

$ cat test.js
function foo () { while (true) { } }
function bar () { return foo(); }
bar();
$ node test.js &
$ gdb attach $(pidof node)
0x00000bf778c63d5f in ?? ()
(gdb) b v8::internal::Runtime_StackGuard
Breakpoint 1 at 0x84a1f0
(gdb) print 'v8::V8::TerminateExecution'(0)