Thomas Geraghty thethomaseffect

Install MongoDB on macOS Sierra

This procedure explains how to install MongoDB using Homebrew on macOS Sierra 10.12.
Official MongoDB install documentation: here

Install Homebrew

Installing Homebrew is effortless, open Terminal and enter :
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

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?

2015-01-29 Unofficial Relay FAQ

Compilation of questions and answers about Relay from React.js Conf.

Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.

What is Relay?

Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
L2 cache reference ........................... 7 ns                     14x L1 cache
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns                     20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs 4X memory

Python Number Conversion Chart

From	To	Expression

	<?xml version="1.0"?>
	<TriggernometryExport Version="1">
	<ExportedTrigger Enabled="true" Name="On Wipe" Id="d2f2668d-dfd5-456d-a404-1d2b5cdd18cd" RegularExpression="(wipeout\|0038:end\|21:([0-9,a-f,A-F]{8}):40000010)" DebugLevel="Inherit" PrevActions="Keep" PrevActionsRefire="Allow" Scheduling="FromFire" PeriodRefire="Allow" RefirePeriodExpression="0">
	<Actions>
	<Action DiscordTts="false" OrderNumber="1" AuraImageMode="Normal" TextAuraAlignment="MiddleCenter" TextAuraFontSize="8.25" TextAuraEffect="None" TextAuraUseOutline="false" Enabled="true" ActionType="EndEncounter" ExecutionDelayExpression="0" Asynchronous="true" DebugLevel="Inherit" RefireInterrupt="false" RefireRequeue="true" SystemBeepFreqExpression="1000" SystemBeepLengthExpression="100" PlaySoundVolumeExpression="100" PlaySoundExclusive="true" PlaySoundMyself="false" PlaySpeechMyself="false" UseTTSVolumeExpression="100" UseTTSRateExpression="0" UseTTSExclusive="true" LaunchProcessWindowStyle="Normal" ExecScriptType="CSharp" MessageBoxIcon

	// hello clever programmers, would you like to play a game?
	// where's the bug?
	// by 0xabad1dea :)

	#include <stdio.h>
	#include <string.h>

	int main() {
	char input[16] = "stringstring!!!";
	char output[8];

	# MaouTranslator.py
	print (str.lower(input("Enter English text to be translated: ")).translate(str.maketrans("abcdefghijklmnopqrstuvwxyz","azyxewvtisrlpnomqkjhugfdcb")))

	# to execute this gist, run the line bellow in terminal
	\curl -L https://raw.github.com/gist/3875946/install_source_code_pro.sh \| sh