liron-navon

Installing postgresql on Mac OS X

$ brew install postgresql@16 $ brew services start postgresql@16

If you fail to ping postgreql, do these steps:

1. Stop PostgreSQL

brew services stop postgresql@16

2. Delete the postmaster.pid

liron-navon

SSH keypair setup for GitHub (or GitHub/GitLab/BitBucket, etc, etc)

Create a repo.

Make sure there is at least one file in it (even just the README.md)

Generate a SSH key pair (private/public):

ssh-keygen -t rsa -C "your_email@example.com"

liron-navon

/**
* This script is used to run measurements on CodeSignal https://app.codesignal.com
* to use it simply open the dev tools, and paste in the console, 
* it will automate the browser for you to run the tests and measure the times it took.
* be patient, there are measurements to prevent blocking from CodeSignal, 
* and this script just automates the browser which means it cannot run tests in parallel
* so the tests will take a while, just run this and go grab a coffee.
* 
* !!!CAUTION!!! this isn't an official script and might get you banned from CodeSignal 
* even though there are measurements to try and prevent this, use caution.

liron-navon

Adb shell # get into the phone's shell
> pm list packages # get the list of packages, skip if you know the package name
> pidof -s <package-name> # get the process ID of the package
> exit # exit the shell and go back to the pc shell
adb logcat --pid=<pid> # log only from a specific process ID

liron-navon

// if you want a demo, just throw it in the console
// it won't work in github's console since they use {"connect-src": "self"} header, you can however do it in google.com
// or almost any other website
//
// yandex translation api is free for up to 1 million characters a day 🤩
// you can set up a free key here: https://tech.yandex.com/translate/
// or just use this, since it's from a fake account it might get blocked in the near future
const KEY = 'trnsl.1.1.20190308T095934Z.95ae5cf4e28588ea.9d108fb6e768af347464925e4e98b91edb0013f5';
const FROM = 'nl'; // default source language
const TO = 'en'; // default target language

liron-navon

// a simple utility function for normalizing return values
const returnValue = values => values.length === 1 ? values[0] : values;;
// a simple function to check existence
const exists = value => value !== undefined && value !== null;
const isString = value => typeof value === 'string';
const isArray = value => Array.isArray(value);

// This is the actual class to hold all of our classes
class ElementAbstraction {
  constructor(htmlElements) {

liron-navon

  // Let's check if the browser supports notifications
  if (!("Notification" in window)) {
    alert("This browser does not support desktop notification");
  }

  function notify() {
    new Notification("Hello world!");
  }

  // Let's check whether notification permissions have already been granted

liron-navon

// the example:
if('indexedDB' in window) {
  // open the database
  openDB(window.indexedDB, 'todos-db')
  // add some todos
  .then(({ db }) => addTodo(db, 'my todo text 1'))
  .then(({ db }) => addTodo(db, 'my todo text 2'))
  // get all the todos
  .then(({ db }) => getTodos(db))
  .then(({ db, event }) => {

liron-navon

const { Worker } = require("worker_threads");
const path = require("path");
const os = require("os");
const ora = require("ora");

// this is how we can get the count of cpu's the computer has,
// using a larger number may result in the app crushing
const cpuCount = os.cpus().length;

// create some big array

liron-navon

const { parentPort, workerData, isMainThread } = require("worker_threads");

// CPU consuming function (sorting a big array)
function sortBigArray(bigArray) {
  return bigArray.sort((a, b) => a - b);
}

// check that the sorter was called as a worker thread
if (!isMainThread) {
  // make sure we got an array of data