Marco Torchiano mtorchiano

Replacing Observer-Observable (inheritance vs. composition)

Since Java 9 the pair Observer-Observable have been declared deprecated.

They don't provide a rich enough event model for applications. 
For example, they support only the notion that something has changed, 
but they don't convey any information about what has changed. 
There are also some thread-safety and sequencing issues that cannot be fixed compatibly.

Java idioms for exposing properties

This work by Marco Torchiano is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

In several application where a general purpose container needs to access specific objects, properties represent a common technique.

We can loosely define a property as an attribute of an object that can be accessed programmatically based on run-time only information.

Where we donate vs. Diseases that kill us - Slopegraph

This gist reports a redesign of the graph shown in the August 20, 2014 article by Vox.

The original diagram uses two paired bubble charts with categorical levels encoded in colors.

The re-design presented here makes use of a slopegraph.

Where we donate vs. Diseases that kill us - Paired Barchart

This gist reports a redesign of the graph shown in the August 20, 2014 article by Vox.

The original diagram uses two paired bubble charts with categorical levels encoded in colors.

The re-design presented here makes use of two paired opposed bar charts.

	from plotnine import *
	import pandas as pd

	class geom_likert(geom_col):
	def __init__(self, **kwargs):
	super().__init__(**kwargs)
	def __radd__(self, other):
	if isinstance(other, ggplot):
	df = other.data
	mapping = other.mapping

	import java.util.Arrays;
	import java.util.stream.Stream;

	import it.polito.po.data.Lyrics;
	/**
	* Explaining how Stream.flatMap() works
	* with a simple code example...
	* @author mtk
	*
	*/

	library(tidyverse)
	library(scales)

	schedule <- data.frame(Date = c("2020-07-13", "2020-07-20", "2020-07-27", "2020-07-31",
	"2020-09-07", "2020-09-14", "2020-09-14", "2020-09-14", "2020-10-05",
	"2020-10-12"),
	Event = c("Abstracts", "Submission", "Submission", "Submission",
	"Notification", "Notification", "Notification", "Submission",
	"Notification", "Camera Ready"),
	Track = c("Full", "Full", "Industry", "Short", "Full", "Industry",

	javascript:(function() {
	let res = [];
	let table = $('#superTable tr');
	let headings = table.eq(0).children().map( (i,x) => x.innerText ).get();
	let dups = {};
	headings = headings.map( e => {
	let n = dups[e] \| 0;
	let ee = n ? e + n : e;
	dups[e] = n + 1;
	return ee;

	package streams;

	import java.util.stream.LongStream;
	import java.util.stream.Stream;

	public class FibonacciStream {

	public static LongStream fibonacciGG() {
	class FibonacciGenerator{
	int prev=0;