joe11051105

rm(list = ls())
iter = 10000
p = runif(iter)
coord = matrix(c(0, 0), ncol = 1)
df = rbind(data.frame(), t(coord))
for (i in 1:iter) {
  indicator = runif(1, 0, 1)
  if (indicator <= 0.05) {
    m = matrix(c(0, 0, 0, 0.16), nrow = 2, ncol = 2)
    const = matrix(c(0, 0), ncol = 1)

joe11051105

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

joe11051105

# 先安裝 gem
gem install httpclient

require "httpclient"

request = HTTPClient.new
request.set_basic_auth("https://api.github.com/user", "joe11051105", "password")
request.get "http://api.github.com/joe11051105/repos"

joe11051105

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

joe11051105

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

var Article = require('../../../models/article');

Those suck for maintenance and they're ugly.

Possible solutions

joe11051105

# be sure to comment out the require 'capistrano/deploy' line in your Capfile!

# config valid only for Capistrano 3.1
lock '3.2.1'

set :application, 'my-cool-application'

# the base docker repo reference
set :name, "johns-stuff/#{fetch(:application)}"

joe11051105

凍仁的讀書清單

編號. 書名 / 進度：

待讀書單

1. DevOps 故障排除 － Linux 伺服器運維最佳實踐 (DevOps Troubleshooting: Linux Server Best Practices) / 40%
2. 時間管理－給系統管理者 (Time Management for System Administrators) / 55%
3. 精通 vi 與 vim / 70%

joe11051105

##Working with ansible-vault

I've been using a lot of Ansible lately and while almost everything has been great, finding a clean way to implement ansible-vault wasn't immediately apparent.

What I decided on was the following: put your secret information into a vars file, reference that vars file from your task, and encrypt the whole vars file using ansible-vault encrypt.

Let's use an example: You're writing an Ansible role and want to encrypt the spoiler for the movie Aliens.

joe11051105

This guide assumes that you recently run brew upgrade postgresql and discovered to your dismay that you accidentally bumped from one major version to another: say 9.3.x to 9.4.x. Yes, that is a major version bump in PG land.

First let's check something.

brew info postgresql

The top of what gets printed as a result is the most important:

joe11051105

{
    "name": "my-app",
    "version": "1.0.0",
    "description": "My test app",
    "main": "src/js/index.js",
    "scripts": {
        "jshint:dist": "jshint src/js/*.js'",
        "jshint": "npm run jshint:dist",
        "jscs": "jscs src/*.js",
        "browserify": "browserify  -s Validating -o ./dist/js/build.js ./lib/index.js",