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There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

1. Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

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Initialize

gitflow	git
git flow init	git init
git commit --allow-empty -m "Initial commit"
git checkout -b develop master

Connect to the remote repository

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#/usr/bin/env bash
# MIT © Sindre Sorhus - sindresorhus.com

# git hook to run a command after `git pull` if a specified file was changed
# Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.

changed_files="$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)"

check_run() {
	echo "$changed_files" | grep --quiet "$1" && eval "$2"

rgaidot

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:

rgaidot

require 'continuation'
#
# Messing around with mimicking Scheme in Ruby by implementing the Yin/Yang puzzle with Kernel#callcc and a fake 'let' macro
# 
# See also:
#   http://blog.gonzih.me/blog/2013/11/26/yin-yang-callcc-puzzle-in-ruby/, 
#   http://stackoverflow.com/questions/16843853/how-to-implement-let-in-scheme
#

# In Scheme (the original)

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#! /bin/bash

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv E56151BF
DISTRO=$(lsb_release -is | tr '[:upper:]' '[:lower:]')
CODENAME=$(lsb_release -cs)
echo "deb http://repos.mesosphere.io/${DISTRO} ${CODENAME} main" | sudo tee /etc/apt/sources.list.d/mesosphere.list

sudo apt-get -y update --fix-missing
sudo apt-get -y install mesosphere

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#!/bin/bash
# cpustatus
#
# Prints the current state of the CPU like temperature, voltage and speed.
# The temperature is reported in degrees Celsius (C) while
# the CPU speed is calculated in megahertz (MHz).

function convert_to_MHz {
    let value=$1/1000
    echo "$value"

rgaidot

Sinatra like routes in Rails controllers

A proof of concept of having Sinatra like routes inside your controllers.

How to use

Since the router is gone, feel free to remove config/routes.rb. Then add the file below to lib/action_controller/inline_routes.rb inside your app.

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# Activate in a modular Sinatra app:
#
#  register Sinatra::Memcacher
#  set :memcacher_enabled, true
#  set :memcacher_expiry, 86400 

# Cache an action:
#
#  get '/' do
#    cache "index" do