zhangzhenfang fangzhzh

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
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

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

This page is not maintained anymore, please update your bookmarks.

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

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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.

	#!/bin/sh

	#
	# a simple way to parse shell script arguments
	#
	# please edit and use to your hearts content
	#


	ENVIRONMENT="dev"

	urlencode() {
	# urlencode <string>

	old_lc_collate=$LC_COLLATE
	LC_COLLATE=C

	local length="${#1}"
	for (( i = 0; i < length; i++ )); do
	local c="${1:$i:1}"
	case $c in

	# works only on Mac OS X with Evernote desktop client installed
	# download the ohlife plaintext export and pipe it to this script
	# eg. $ cat ~/Downloads/ohlife_2012blablabla.txt \| python ohlife_to_evernote.py
	# don't forget to change the notebook title if it's not "Journal"

	from pipes import quote
	import sys
	import os

	buf = ''

	cd ~
	git clone [email protected]:fangzhzh/.vim.git
	ln -s ~/.vim/.vimrc ~/.vimrc
	git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim
	vim +PluginInstall +qall
	d ~/.vim/bundle/YouCompleteMe && ./install.py --clang-completer