kenny teh 8kigai

Group array of JavaScript objects by keys

This fork of JamieMason's implementation changes the key parameter to be an array of keys instead of just a single key. This makes it possible to group by multiple properties instead of just one.

Implementation

const groupBy = keys => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = keys.map(key => obj[key]).join('-');

System Design Cheatsheet

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

Basic Steps

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?

Setting up github and bitbucket on the same computer (Windows)

Guide for Windows

mix3d asked for some help using this guide with windows so here we go. This was tested with Windows 10. Run all commands in Git Bash once it's installed.

Github will be the main account and bitbucket the secondary.

Git for Windows

Download and install Git for Windows
- In the installer, select everything but decide if you want a desktop icon (2nd step)

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"

Stevey's Google Platforms Rant

I was at Amazon for about six and a half years, and now I've been at Google for that long. One thing that struck me immediately about the two companies -- an impression that has been reinforced almost daily -- is that Amazon does everything wrong, and Google does everything right. Sure, it's a sweeping generalization, but a surprisingly accurate one. It's pretty crazy. There are probably a hundred or even two hundred different ways you can compare the two companies, and Google is superior in all but three of them, if I recall correctly. I actually did a spreadsheet at one point but Legal wouldn't let me show it to anyone, even though recruiting loved it.

I mean, just to give you a very brief taste: Amazon's recruiting process is fundamentally flawed by having teams hire for themselves, so their hiring bar is incredibly inconsistent across teams, despite various efforts they've made to level it out. And their operations are a mess; they don't real

	import NextAuth from "next-auth";
	import GoogleProvider from "next-auth/providers/google";
	import PostgresAdapter from "../../../lib/adapter";

	const pool = new Pool({
	user: "postgres",
	host: "localhost",
	database: "postgres",
	password: "postgres",
	port: 5432,

	#!/bin/sh

	# Empty all rules
	sudo iptables -t filter -F
	sudo iptables -t filter -X

	# Bloc everything by default
	sudo iptables -t filter -P INPUT DROP
	sudo iptables -t filter -P FORWARD DROP
	sudo iptables -t filter -P OUTPUT DROP

	/**
	* @fileoverview Pearson correlation score algorithm.
	* @author [email protected] (Matt West)
	* @license Copyright 2013 Matt West.
	* Licensed under MIT (http://opensource.org/licenses/MIT).
	*/


	/**
	* Calculate the person correlation score between two items in a dataset.

	#!/bin/bash

	aptitude -y install expect

	// Not required in actual script
	MYSQL_ROOT_PASSWORD=abcd1234

	SECURE_MYSQL=$(expect -c "

	set timeout 10