Trevor Hartman devth

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

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

Move /etc/zshenv

See here: http://vim.1045645.n5.nabble.com/MacVim-and-PATH-td3388705.html#a3392363
Do this: sudo mv /etc/zshenv /etc/zprofile

Get rbenv and ruby working in MacVim

Put this in your ~/.zprofile

	Function.prototype.runOnBackgroundThread = function (aCallback) {
	var _blob = new Blob(['onmessage = '+this.toString()],{"type":"text/javascript"});
	var _worker = new Worker((webkitURL.createObjectURL \|\| URL.createObjectURL)(_blob));
	_worker.onmessage = aCallback;
	_worker.postMessage();
	}

	var _test = function () {
	postMessage((1+1).toString());
	}

	;; based on core.logic 0.8-alpha2 or core.logic master branch

	(ns sudoku
	(:refer-clojure :exclude [==])
	(:use clojure.core.logic))

	(defn get-square [rows x y]
	(for [x (range x (+ x 3))
	y (range y (+ y 3))]
	(get-in rows [x y])))

	"hide passwords when editing (you can use select mode to see it), doesn't work
	"with all terminal types, but useful
	hi Password ctermfg=black ctermbg=black cterm=NONE guifg=black guibg=black
	match Password /pass.\s=\s\k\{-}\zs[^ ]\ze.\{-}/

	(ns datomic-helpers
	(:require [datomic.api :as d]))

	;;; Expose Datomic vars here, for convenience

	;;; Ring middleware

	(defn wrap-datomic
	"A Ring middleware that provides a request-consistent database connection and
	value for the life of a request."

	//This sample is how to use websocket of Tomcat.
	package wsapp;

	import java.io.IOException;
	import java.nio.ByteBuffer;
	import java.nio.CharBuffer;
	import java.util.ArrayList;
	import org.apache.catalina.websocket.MessageInbound;
	import org.apache.catalina.websocket.StreamInbound;
	import org.apache.catalina.websocket.WebSocketServlet;

	require 'action_dispatch/middleware/static'

	module Middleware
	class FileHandler < ActionDispatch::FileHandler
	def initialize(root, assets_path, cache_control)
	@assets_path = assets_path.chomp('/') + '/'
	super(root, cache_control)
	end

	def match?(path)