staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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eulerfx

There are some clear distinctions between commands and events but there are also some not so clear. I discuss the notion of a command as an interpretation of an event.

Commands are requests to do something, they are named in the imperative tense and capture intent. In CQRS, commands are distinguished from queries because they invoke behaviors therefore causing state changes whereas queries don't. In some frameworks, there is a distinction between commands and events in that one sends commands and publishes events. Commands are sent to a single logical handler whereas events are broadcast to potentially multiple handlers.

Events are characterized as being in the past tense. In addition to naming this imposes the constraint that events can't be rejected - you can't change the past. Furthermore, an event can be regarded as an outcome of a command - a causality relation.

There are perspectives where the distinction blurs. For example, what is the distinction between a command handler and an event handler?

lelandbatey

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert "$1" -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 "$2"

Results

tony4d

Download and install p4merge

• Download the perforce visual tool suite from here: http://www.perforce.com/perforce/downloads/index.html
• Copy only the p4merge.app file into your /Applications/ directory

Setup p4merge as a visual mergetool

JakeWharton

// Copyright 2012 Square, Inc.
package com.squareup.widgets;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.ImageView;

/** Maintains an aspect ratio based on either width or height. Disabled by default. */
public class AspectRatioImageView extends ImageView {

endolith

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