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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

Clojure REPL in java

Dependencies

<dependencies>
  <dependency>
    <groupId>org.clojure</groupId>
    <artifactId>clojure</artifactId>
    <version>1.8.0</version>

Entities and Components

An entity is just a number.

There is a graph of components, indexed by the entity id.

All state is stored in one place.

var components = { Position: {}, Velocity:{}, Spite: {}, Timer: {}, ScreenShake: {}, RemoveComponents: {} }

	local format = string.format
	local tjoin = table.concat
	local tostring = tostring
	local type = type
	local floor = math.floor
	local pairs = pairs
	local ipairs = ipairs
	local error = error

	module 'pretty'

	/*
	* This work is free. You can redistribute it and/or modify it under the
	* terms of the Do What The Fuck You Want To Public License, Version 2,
	* as published by Sam Hocevar. See the COPYING file for more details.
	*/
	/*
	* Easing Functions - inspired from http://gizma.com/easing/
	* only considering the t value for the range [0, 1] => [0, 1]
	*/
	EasingFunctions = {

	(ns n01se.externs-for-cljs
	(:require [clojure.java.io :as io]
	[cljs.compiler :as comp]
	[cljs.analyzer :as ana]))

	(defn read-file [file]
	(let [eof (Object.)]
	(with-open [stream (clojure.lang.LineNumberingPushbackReader. (io/reader file))]
	(vec (take-while #(not= % eof)
	(repeatedly #(read stream false eof)))))))

	<div class="container">
	<div class="row">
	<div class="col-sm-6 col-md-4 col-md-offset-4">
	<h1 class="text-center login-title">Sign in to continue to Bootsnipp</h1>
	<div class="account-wall">
	<img class="profile-img" src="https://lh5.googleusercontent.com/-b0-k99FZlyE/AAAAAAAAAAI/AAAAAAAAAAA/eu7opA4byxI/photo.jpg?sz=120"
	alt="">
	<form class="form-signin">
	<input type="text" class="form-control" placeholder="Email" required autofocus>
	<input type="password" class="form-control" placeholder="Password" required>

	#!/bin/bash

	# Build latest version of Emacs, version management with stow
	# OS: Ubuntu 14.04 LTS and 15.04
	# version: 24.5
	# Toolkit: lucid

	set -e

	readonly version="24.5"