KatrinaHoffert

Scala is an object oriented and functional language that compiles to class files for use on the JVM (same as Java). Biggest advantage is that it provides very powerful functional programming concepts as well as a number of useful programming tools for writing cleaner or less code (two major complaints about Java is that it is overly verbose and slow to evolve).

This file explains the basics to Scala as well as some cool features about it. The point is to make it clear that it's probably not going to be a difficult jump to use and in fact may be completely worthwhile.

Types and variables

Types like those in Java

Most of Scala's basic types are very similar to Java's. Main difference is that they're all objects. And thus, we write the type in uppercase (Scala code conventions are very similar to Java's). Also, types now go after the variable name. An example of a simple function is shown below:

def greet(name: String) = {

KatrinaHoffert

First: The term monad is a bit vacuous if you are not a mathematician. An alternative term is computation builder which is a bit more descriptive of what they are actually useful for.

You ask for practical examples:

Example 1: Handling would-be partial functions:

def divide(numerator: Int, denominator: Int): Option[Int] = {
	if(denominator != 0) Some(numerator / denominator)
	else None

KatrinaHoffert

#!/usr/bin/env python      1
import Tkinter as tk       2

class Application(tk.Frame):              3
    def __init__(self, master=None):
        tk.Frame.__init__(self, master)   4
        self.grid()                       5
        self.createWidgets()

    def createWidgets(self):

KatrinaHoffert

<input id="locationId" type="hidden" value="123" />
<button id="submitButton">Submit</button>

<script>
  $("#submitButton").on("click", function() {
      // TODO: check if set, first, and handle case of not set
      var locationId = $("#locationId").val();
      var destUrl = jsRoutes.controllers.LocationController
          .showLocation(locationId).url;
      window.location(destUrl);

KatrinaHoffert

COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/lto-wrapper.exe
Target: x86_64-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/gcc/gcc-4.9.2-2.x86_64/src/gcc-4.9.2/configure --srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.2-2.x86_64/src/gcc-4.9.2 --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C --build=x86_64-pc-cygwin --host=x86_64-pc-cygwin --target=x86_64-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --enable-__cxa_atexit --with-dwarf2 --with-tune=generic --enable-languages=ada,c,c++,fortran,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-s

KatrinaHoffert

	.file	"hello.c"
	.section .rdata,"dr"
.LC0:
	.ascii "Hello, World!\0"
	.text
	.globl	sayHello
	.def	sayHello;	.scl	2;	.type	32;	.endef
	.seh_proc	sayHello
sayHello:
	pushq	%rbp

KatrinaHoffert

/**
 * jQuery Typeahead
 * Copyright (C) 2014 RunningCoder.org
 * Licensed under the MIT license
 *
 * @author Tom Bertrand
 * @version 1.7.6 (2015-01-17)
 *
 * @link
 * http://www.runningcoder.org/jquerytypeahead/

KatrinaHoffert

/*------------------------------------*\
    CONTENTS
\*------------------------------------*/
/*
LAYOUT
INPUT, BUTTON & DROPDOWN
*/

/*------------------------------------*\
    LAYOUT

KatrinaHoffert

jack: function(req, res) {
		if (req.isSocket && req.body.hasOwnProperty('gameId') && req.body.hasOwnProperty('pNum') && req.body.hasOwnProperty('thiefId') && req.body.hasOwnProperty('victimId') && req.body.hasOwnProperty('jackId') && req.body.hasOwnProperty('targetId')) {

			Game.findOne(req.body.gameId).populate('players').populate('deck').populate('scrap').exec(function(error, game) {
				if (error || !game) {
					console.log("Game " + req.body.gameId + " not found for jack");
					res.send(404);
				} else {
					Player.find([req.body.thiefId, req.body.victimId]).populate('hand').populate('points').populate('runes').exec(function(erro, players) {
						if (erro || !players[0] || !players[1]) { 

KatrinaHoffert

import java.awt.Point;

public class Main {
	public static int[][] create2dArray(int size) {
		int[][] array = new int[size][size];
		
		for(int row = 0; row < size; ++row) {
			for(int col = 0; col < size; ++col) {
				array[row][col] = (col + 1) + size * row;
			}