Kyle Oba mudphone

Clojure Destructuring Tutorial and Cheat Sheet

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

Step 0:

Get Homebrew installed on your mac if you don't already have it

Step 1:

Install highlight. "brew install highlight". (This brings down Lua and Boost as well)


	;; Display alchemist buffers always at the right side
	;; Just change (side . right) with the position you would like 'bottom, 'top, 'right or 'left
	;; Source: http://www.lunaryorn.com/2015/04/29/the-power-of-display-buffer-alist.html
	(add-to-list 'display-buffer-alist
	`(,(rx bos (or "alchemist test report"
	"alchemist mix"
	"alchemist help"))
	(display-buffer-reuse-window
	display-buffer-in-side-window)

	/* The Y combinator in Swift!

	For a discussion of what the heck this is all about, see http://www.ece.uc.edu/~franco/C511/html/Scheme/ycomb.html

	The nifty thing is that it allows us to implement recursion without the ability for a function to refer to itself from within its own definition.

	Note how we manage a recursive definition of factorial without any function referring to its own name.

	Thanks to @eridius for help with the SelfToUnderlying<T> type.
	*/

	// Y-combinator in Swift.

	func Y<y,⒴>(𝖸:((y)->⒴)->((y)->⒴))->((y)->⒴){
	var Ｙ:((y)->⒴)!;Ｙ=𝖸{Ｙ($0)};return Ｙ
	}

	// Couldn't find a way to avoid such explicitness.
	// If types are defined in the inner function, compiler cannot infer type of 'f'.
	let factorial = Y {(f:((Int)->Int)) -> ((Int)->Int) in
	return {n in

	<!DOCTYPE html>
	<html>
	<head>
	<style type="text/css">
	html, body, #map_canvas { height: 100%; margin: 0;}
	</style>
	<script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
	<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
	<script src="https://raw.github.com/mbostock/topojson/master/topojson.js"></script>
	<script src="https://raw.github.com/JasonSanford/GeoJSON-to-Google-Maps/master/GeoJSON.js"></script>

	(ns overtunes.songs.row-row-row-your-boat
	(:use
	[overtone.live]))

	(definst harpsichord [freq 440]
	(let [duration 1]
	(*
	(line:kr 1 1 duration FREE)
	(pluck (* (white-noise) (env-gen (perc 0.001 5) :action FREE))
	1 1 (/ 1 freq) (* duration 2) 0.25))))

	! Molokai theme
	xtermbackground: #101010
	xtermforeground: #d0d0d0
	xtermcursorColor: #d0d0d0
	xtermcolor0: #101010
	xtermcolor1: #960050
	xtermcolor2: #66aa11
	xtermcolor3: #c47f2c
	xtermcolor4: #30309b
	xtermcolor5: #7e40a5

Kyle Oba mudphone

Clojure Destructuring Tutorial and Cheat Sheet

Vectors and Sequences

Step 0:

Step 1:

Step 2: