a0726h77

#!/usr/bin/env python
# encoding: utf-8

import cv2
import numpy as np

READ_PICTURE = 1  # 0 => read from camera
PICTURE_PATH = "sample.jpg"

THRESHOLD = 180

jasongilman

Atom Clojure Setup

This describes how I setup Atom for an ideal Clojure development workflow. This fixes indentation on newlines, handles parentheses, etc. The keybinding settings for enter (in keymap.cson) are important to get proper newlines with indentation at the right level. There are other helpers in init.coffee and keymap.cson that are useful for cutting, copying, pasting, deleting, and indenting Lisp expressions.

Install Atom

Download Atom

The Atom documentation is excellent. It's highly worth reading the flight manual.

papachan

Keybinding	Description
C-h C-a	help start screen
C-x C-c	save-buffers-kill-emacs (exit emacs)
C-g	keyboard-quit
M-esc esc	keyboard-escape-quit
C-x z	Magic. repeat last operation
M-!	shell command
ESC !	shell-command
ESC x compile	compile ("make -k" is default)

ilyaigpetrov

Meteor Alternatives Per Feature

This table was created in 2015 so may be quite outdated today.

Feature	Meteor Solution	Alternative Solutions	Description
Live DB Sync	[livequery][lq] ([mongo-oplog]), [ddp]	RethinkDB, Redis, ShareDB, [npm:mongo-oplog], [firebase], etc.	Push DB updates to client/server.
Latency Compensation, Optimistic UI	[minimongo][mm]	[RethinkDB][lcr], [mWater/minimongo] (fork, not ws but http, browserify)	Imitate successful db query on client before it is done.
Isomorphic Code	[isobuild] & isopacks	browserify	Write one code for server/client/mobile.
Isomorphic Packaging	[isobuild], atmosphere		No more separate packages for server & client. Get bower + npm + mobile.

ilyaigpetrov

Client/Server Data Synchronization

Open Source

• Redis
  In-memory db with notifications, may be used alongside other DB.
• Meteor
  • MongoDB | Livequery | server DDP | DDP client | minimongo
  • Livequery for DB updates subscriptions (MongoDB)
  • Minimongo is MongoDB imitation, used for latency compenstion.

• Opinionated, heavy, not very modular.

RadialLayout.cs

using UnityEngine;
using UnityEngine.UI;
/*
Radial Layout Group by Just a Pixel (Danny Goodayle) - http://www.justapixel.co.uk
Copyright (c) 2015

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

ericelliott

ES6 Defaults / Overrides Pattern

Combine default parameters and destructuring for a compact version of the defaults / overrides pattern.

function foo ({
    bar = 'no',
    baz = 'works!'
  } = {}) {

Integralist

• defprotocol: defines an interface
• deftype: create a bare-bones object which implements a protocol
• defrecord: creates an immutable persistent map which implements a protocol

Typically you'll use defrecord (or even a basic map);
unless you need some specific Java inter-op,
where by you'll want to use deftype instead.

Note: defprotocol allows you to add new abstractions in a clean way Rather than (like OOP) having polymorphism on the class itself,

jonschlinkert

Unary operators

(and the oddities of number evaluation in JavaScript)

Type conversion, typecasting, and coercion are different ways of, implicitly or explicitly, changing an entity of one data type into another. [--wikipedia][wikipedia]

Unary operators, or "typeof +'foo' === huh?"

john2x

Clojure Destructuring Tutorial and Cheat Sheet

(Related blog post)

Simply put, destructuring in Clojure is a way extract values from a datastructure and bind them to symbols, without having to explicitly traverse the datstructure. It allows for elegant and concise Clojure code.

Vectors and Sequences