disolovyov

Functional Programming

Below is the material for lectures and sessions we've had so far, crammed into one file. When only concrete parts of a book chapter are required for understading, it is marked as such in parenthesis. Which is not to say it is forbidden to read whole chapters and learn new things outside of class.

Lecture: Essential Ideas

Functional programming

We have 3 great event topics for you, but can't decide which one to explore first. Please, help us!

Go on App Engine
http://golang.org/
https://developers.google.com/appengine/

It's a relatively new language from Google with interesting concurrency mechanisms. It recently got Google App Engine support, which is what we intend to explore in a full-day event.

OOP in Scala
http://www.scala-lang.org/

[App Engine Go SDK][appengine-go-sdk]
[App Engine Go manual][appengine-go-manual]
[Go Specification][go-spec]
[Go standard library docs][go-core-docs]
Go's [error handling][thispltlife]. You can try figuring it out: there's a [blog post][errors-blog] and a [book section][errors-book]. Alternatively, you can give up and use two error-handling functions provided below.

func error2(err error, c appengine.Context) bool {
    if err != nil {
 c.Errorf("%v", err.Error())

	{-# LANGUAGE NoImplicitPrelude, MultiParamTypeClasses, Rank2Types, TypeOperators #-}

	newtype Id a =
	Id a

	data a :\/ b =
	Left a
	\| Right b

	data a :/\ b =

	package checked.exceptions.suck;

	public class RuntimeAllTheThingsHelper {

	public interface RuntimeAllTheThings<T> {
	T runLikeABoss() throws Exception;
	}

	public static <T> T runLikeABoss(RuntimeAllTheThings<T> block) {
	try {

	--[[
	No-nonsense classes for Lua.

	Basic usage:

	A = class() -- class declaration
	B = class(A) -- inheritance
	function A:init(arg, arg ...) -- constructor
	function A:foo(arg, arg ...) -- method declaration
	a = A(arg, arg ...) -- construction

	[29.04.2013 15:05:41] Alexey Buzdin:
	assertThat(jonSnow.knows(any(Object.class), is(true)))
	AssertionError!

	[29.04.2013 15:09:21] Dimitry Solovyov:
	class JonSnow {
	public <T> boolean knows(T subject) {
	return false;
	}
	}

	# You need to manually edit this file to fit your needs.
	# This configuration assumes the default installation prefix
	# of /opt/graphite/, if you installed graphite somewhere else
	# you will need to change all the occurances of /opt/graphite/
	# in this file to your chosen install location.

	<IfModule !wsgi_module.c>
	LoadModule wsgi_module modules/mod_wsgi.so
	</IfModule>

	brew install readline && \
	cabal install readline --extra-include-dirs=/usr/local/Cellar/readline/6.2.4/include --extra-lib-dirs=/usr/local/Cellar/readline/6.2.4/lib --configure-option=--with-readline-includes=/usr/local/Cellar/readline/6.2.4/include --configure-option=--with-readline-libraries=/usr/local/Cellar/readline/6.2.4/lib && \
	cabal install lambdabot

	public class Batcher<T> {

	private class Batch<T> {

	private final Collection<T> items = new ConcurrentLinkedQueue<>();
	private final AtomicInteger permits = new AtomicInteger();

	private Collection<T> getItems() {
	return items;
	}