tenderlove

require 'fiddle'

SIZEOF_HEAP_PAGE_HEADER_STRUCT = Fiddle::SIZEOF_VOIDP

SIZEOF_RVALUE           = 40
HEAP_PAGE_ALIGN_LOG     = 14
HEAP_PAGE_ALIGN         = 1 << HEAP_PAGE_ALIGN_LOG      # 2 ^ 14
HEAP_PAGE_ALIGN_MASK    = ~(~0 << HEAP_PAGE_ALIGN_LOG)  # Mask for getting page address
REQUIRED_SIZE_BY_MALLOC = Fiddle::SIZEOF_SIZE_T * 5     # padding needed by malloc
HEAP_PAGE_SIZE          = HEAP_PAGE_ALIGN - REQUIRED_SIZE_BY_MALLOC # Actual page size

phlipper

• Codecademy
• Code School
• CodeQuizzes
• Confreaks
• IA-Contest
• Learn Ruby the Hard Way
• Practicing Ruby
• Pragmatic Programmer
• Rubies in the Rough
• Ruby5 Podcast

JunichiIto

This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

davidstrauss

import os
import pprint
import fnmatch
import time
import subprocess

def find_services_needing_restart():
    services = {}
    pids = [ f for f in os.listdir('/proc') if f.isdigit() and os.path.isdir(os.path.join('/proc', f)) ]

hlung

How to connect PS3 controller to a Mac or PC

This is how you connect PS3 controller to Mac OSX, PC, etc. when previously connected to a PS3. You will need a Mini USB cable. Overcome your laziness, get up of your chair, and go get one!

A big misconception is that keep holding PS button will reset the controller's pairing. It DOES NOT! From my testings, the controller keeps paring with the last machine it was CONNECTED VIA A USB CABLE.

Here are the steps:

max-mapper

var serialport = require('node-serialport')

var sp = new serialport.SerialPort("/dev/ttyO3", { 
  parser: serialport.parsers.raw,
  baud: 9600
})

sp.on('data', function(chunk) {
  console.log(chunk.toString('hex'), chunk.toString(), chunk)
})

andreyvit

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

hellerbarde

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

demonbane

#!/bin/sh

echo "What should the Application be called (no spaces allowed e.g. GCal)?"
read inputline
name="$inputline"

echo "What is the url (e.g. https://www.google.com/calendar/render)?"
read inputline
url="$inputline"