Aleksey Usatov tuscen

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

tmux cheatsheet

As configured in my dotfiles.

start new:

tmux

start new with session name:

Rate limiting with Redis

June 2011 - Chris O'Hara - (archived original post)

Rate limiting can be an effective way of conserving resources and preventing automated or nefarious activities on your site.

A common use case is to limit the amount of requests an IP can make over a certain time frame. For example, you might want to restrict users from using an expensive search utility on your site. If the user attempts to search more than 5 times a minute, you can redirect them to another page informing them that they need to wait.

IP based rate limiting is already in use on larger sites. Google and Yahoo both employ the technique to prevent (or at least complicate) automated requests to their services.

The Task-based Asynchronous Pattern

Stephen Toub, Microsoft February 2012 Original

	kirill.mokevnin [8:19 PM]
	тут в соседнем чате спросили почему дефолты в базе зло, но по скольку это касается не только руби, предлагаю обсудить

	kirill.mokevnin [8:19 PM]
	тут

	kirill.mokevnin [8:20 PM]
	Кто согласен не согласен?

	ivanlemeshev [8:21 PM]

	sumyuga [7:57 PM] вот такой вопрос меня последние два дня волнует:
	а пишут ли веб в функциональном стиле? читал что Lisp используют для веба и даже в продакшене он себя хорошо чувствует.
	просто на мой взгляд это скорее эзотерика, хотя с приходом reactjs может многое изменится, кто что думает?

	kirill.mokevnin [8:05 PM]
	В функциональном стиле пишут функции, а не веб
	когда в любом языке программирования вы используете функцию map, вы пишите этот кусочек программы в функциональном стиле

	sumyuga [8:06 PM]
	ну в общем вы меня поняли )) да, есть же clojure, совсем забыл ))

	# Simple bijective function
	# Basically encodes any integer into a base(n) string,
	# where n is ALPHABET.length.
	# Based on pseudocode from http://stackoverflow.com/questions/742013/how-to-code-a-url-shortener/742047#742047

	ALPHABET =
	"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".split(//)
	# make your own alphabet using:
	# (('a'..'z').to_a + ('A'..'Z').to_a + (0..9).to_a).shuffle.join

	using System;
	using System.Collections.Generic;
	using System.Diagnostics;
	using System.Linq;
	using System.Threading;
	using System.Threading.Tasks;
	using StackExchange.Redis;

	namespace CitySurvival.Redis
	{

	// create file:
	sudo vim /usr/share/applications/intellij.desktop

	// add the following
	[Desktop Entry]
	Version=13.0
	Type=Application
	Terminal=false
	Icon[en_US]=/home/rob/.intellij-13/bin/idea.png
	Name[en_US]=IntelliJ