Michael Wood eddanger

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

Using Obj-C with MacRuby/Rubymotion

This little post aims to help you to translate Objective-C Blocks into Ruby blocks. Let's start by taking a look at few examples of iOS API call where blocks are used for animations and enumeration

Ruby Lambda Syntaxes:

Im Rubymotion and MacRuby you can use all the Ruby Lambda syntaxes that are:

block = lambda { |param|  ... }

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	import React, { Component } from 'react'
	import { Block, Flex } from 'jsxstyle'

	const Row = Flex
	const Col = (props) => <Flex {...props} flexDirection="column"/>

	var history = {
	redo_list: [],

	undo_list: [],

	#!/bin/sh

	export CFLAGS="-march=core2 -O3 -pipe -fomit-frame-pointer"
	VERSION="1.9.3-p327"
	curl https://raw.github.com/gist/1688857/2-$VERSION-patched.sh > /tmp/$VERSION-perf
	rbenv install /tmp/$VERSION-perf

	function rmb {
	current_branch=$(git branch --no-color 2> /dev/null \| sed -e '/^[^]/d' -e 's/ \(.*\)/\1/')
	if [ "$current_branch" != "master" ]; then
	echo "WARNING: You are on branch $current_branch, NOT master."
	fi
	echo "Fetching merged branches..."
	git remote prune origin
	remote_branches=$(git branch -r --merged \| grep -v '/master$' \| grep -v "/$current_branch$")
	local_branches=$(git branch --merged \| grep -v 'master$' \| grep -v "$current_branch$")
	if [ -z "$remote_branches" ] && [ -z "$local_branches" ]; then