hgmnz

Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

stefanfoulis

OSX Developer System installation

This guide assumes a fresh install of Mac OSX 10.7 Lion.

Brew User

jeresig

au BufRead,BufNewFile jquery.*.js set ft=javascript syntax=jquery
set nocompatible
set autoindent
set tabstop=2
set showmatch
set vb t_vb=
set ruler
set nohls
set incsearch
syntax on

pithyless

Install Python

$ brew install readline sqlite gdbm
$ brew install python --universal --framework
$ python --version
Python 2.7

Symlinks...

jxson

Synopsis

At the top of the file there should be a short introduction and/ or overview that explains what the project is. This description should match descriptions added for package managers (Gemspec, package.json, etc.)

Code Example

Show what the library does as concisely as possible, developers should be able to figure out how your project solves their problem by looking at the code example. Make sure the API you are showing off is obvious, and that your code is short and concise.

Motivation

panuta

Command Line Tools for Xcode

Command line tools comes bundle with Xcode prior to 4.3 version. After 4.3, you need to install a separated command line tools yourself.

First, go to this url and login using Apple Developer account (Free to register)

https://developer.apple.com/downloads/index.action

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
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 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

liammclennan

Backbone is a library of tools that simplify the design and implementation of client-side web applications. It is explicitly not a framwework. Backbone does not provide guidance about how to assemble an application. This post will be an initial attempt at filling that gap. It assumes an intermediate level of Backbone.js knowledge. If you have never used Backbone.js try Backbone.js Basics or the Backbone.js homepage.

The Application Root

I like to provide a root object/namespace for my application. Let's call it app.

var app = {};

Register Components on the Application Object

mgreenly

WorkflowEventsController < ApplicationController
  # . . . 
  def create
    workflow_event = WorkflowEvent.new(params[:workflow_event])
    @some_model = SomeModel.find(params[:some_model_id]
    SomeWorkflow.new(current_user, @some_model).handle(workflow_event) do |result|
      result.on_success { render :template => 'success' }
      result.on_failure { render :template => 'failure' }
    end
  end

nsfyn55

class Node:
  def __init__(self,val,nxt):
    self.val = val
    self.nxt = nxt

def prnt(n):
  nxt = n.nxt
  print n.val
  if(nxt is not None):
    prnt(nxt)