Blogs

Woo Woo Woo — also known as just Woo Woo — is a simple, totally-private, binaural beats app for meditation, relaxation, focus, and sleep.

Because we use binaural beats every day, we took the time to create an app that works simply and privately, and has the features we want.

August 9, 2025: Valley Programming is proud to announce the Version 2.0 release of our Back To Now app for iPhone and iPad devices!

If you’re interested in learning the Scala programming language or functional programming, Alvin Alexander, the author of the Scala Cookbook, has created a website dedicated to these two topics. Here’s a link to his free Scala and functional programming video training courses on LearnScala.dev.

As a little update, here’s a link to a free “Introduction to Functional Programming” video training course. The training course consists of over 50 videos, all of which are free.

This is a free “functional programming in Scala 3” video training course, created by Alvin Alexander, the author of the following Scala and functional programming books:

Dateline, April, 2023: Alvin Alexander’s newest book, “Learn Functional Programming The Fast Way!”, is a #1 Best-Seller in three computer programming book categories:

• Computer Programming (general)
• Functional Programming
• Data Modeling and Design

This image shows the book being the best-selling book in Amazon’s Functional Programming category on April 12, 2023:

A technique that I’ve known for a long time — but has been improved by my recent Certified ScrumMaster (CSM) and Certified Product Owner (CSPO) training — is how to conduct a “User Story Mapping Workshop” at the beginning of a new software development project.

As a brief note today (May 2, 2022), Alvin Alexander is now a Certified Scrum Product Owner (CSPO), certified by the Scrum Alliance. This is in addition to his many years of leading agile software teams in Scrum, Scrum-like, and Scrumban environments, and also being a Certified ScrumMaster (CSM).

As a brief note today (April 24, 2022), Alvin Alexander is now a Certified ScrumMaster (CSM), certified by the Scrum Alliance. This is in addition to his many years of leading agile software teams in Scrum, Scrum-like, and Scrumban environments.

Back To Then is a “photo frame” slideshow app. Just copy your favorite photos into the app and then press Start Slideshow, and it slowly rotates your photos in full-screen mode on your device. When you want to stop the screensaver, just tap the screen to return to the main menu.

Back To Then doesn’t have any ads, and it doesn’t access the internet, so your photos remain completely private to you.

How It Works

To use Back To Then:

This is the beginning of a Docker cheat sheet. I couldn’t find any out here that I liked, so I’m starting to create my own, which will hopefully be organized the way I like it. (This cheat sheet is cross-posted at alvinalexander.com/programming/docker-cheat-sheet-cheatsheet.)

Docker Basics

Recommended as a first command on a Docker system:

docker version     # should show Client and Server sections

Docker Lifecycle

This section mostly comes from (https://github.com/wsargent/docker-cheat-sheet):