Scala, Java, Unix, MacOS tutorials (page 24)

My free “Advanced Scala 3” video training course

March 24, 2024: I just released my free “Advanced Scala 3” online video training course. This free video course gets into different Scala programming topics such as functions, types, generics with variance and bounds, multiversal equality, modular programming, extension methods, and much more.

As always I want to thank Ziverge’s software consulting services for sponsoring these videos! These video courses take many weeks and even months to create, and they would not exist without Ziverge.

<<Click here to start my free Advanced Scala 3 video training course.>>

Free Scala 3 online video training courses

March 26, 2024 Update: As a brief note today, here are links to my new, free online video training courses:

As always, these videos are sponsored by Ziverge software consulting (specializing in Rust, Scala, and ZIO).

Free functional programming book (free PDF for Scala, Java, Kotlin, etc.)

April, 2024: As a brief note today, the PDF version of my book, Learn Functional Programming The Fast Way!, is now FREE. I wrote this functional programming book for Scala, Java, and Kotlin developers, and you can now download it for free here:

Learn Functional Programming The Fast Way! (free PDF)

If you’re interested in functional programming, or just want to learn more about data types, generics, pure functions, expression-oriented programming, and functional error handling, I hope this book is helpful.

Free functional programming book (for Scala, Java, Kotlin, etc.)

ZIO 2: How to read a file and write its output to the console

As a brief example here today, the following Scala/ZIO source code shows one way to read a file using ZIO 2 and then print its output to the console:

Why companies are leaving the Cloud

Here are two good quotes from this article, Why companies are leaving the Cloud:

“Another significant driver was the failure to meet internal expectations, at 24%.‘Unmet expectations’ describes most technology trends I’ve been involved with, including client/server, enterprise application integration, service-oriented architecture. and now cloud.

Those surveyed also cited unexpected costs, performance issues, compatibility problems, and service downtime. The most common motivator for repatriation I’ve been seeing is cost. In the survey, more than 43% of IT leaders found that moving applications and data from on-premises to the cloud was more expensive than expected.”

IntelliJ IDEA MacOS: Next tab, previous tab keystrokes

IntelliJ IDEA MacOS FAQ: What are the keystrokes to switch to the previous editor tab and next editor tab when using IntelliJ IDEA on a Mac/MacOS system?

Solution

To move to the next editor tab and previous editor tab when using IntelliJ IDEA on macOS, these keystrokes work for me:

[Command][Shift][LeftBracket] moves to the previous editor tab
[Command][Shift][RightBracket] moves to the next editor tab

Also note that when I write:

[LeftBracket] I mean the [ character
[LeftBracket] I mean the ] character

SBT/build.sbt: One percent symbol or multiple percent symbol for Java and Scala dependencies?

As a brief note today, when you’re using SBT and its build.sbt file with Scala projects:

use %% in library dependencies when referring to Scala-specific libraries, and
use only one % character when referring to other JVM dependencies, like Java dependencies/libraries

Here are some examples of this syntax:

I Am That, by Nisargadatta Maharaj (review)

I recently started reading the “spiritual classic” book, I Am That, by Nisargadatta Maharaj. The book is rated 4.8 stars on Amazon and 4.4 on Goodreads, so that’s pretty impressive.

After reading the first 100 pages or so, I’m glad to report personally that there isn’t anything significantly new here for me. Even though I never saw Ram Dass refer to Nisargadatta Maharaj, the words in this book are remarkably similar to those in Ram Dass’s best books, which I have already written about. That is, the words are a little different, but all of the concepts are the same, and they are consistent with what I know about meditation.

Ram Dass’s Grist for the Mill

In my earlier posts on the best Ram Dass book to start with and the best Ram Dass books I know, I didn’t mention his book, Grist for the Mill.

Since I forgot to mention it, today I’d like to note a few things about it. First, I think it’s a really good book, it’s just not the first Ram Dass book I’d recommend.

Coldplay’s Chris Martin: “So happy to be alive”

US Magazine has a little story on the separation of Coldplay singer Christ Martin and Gwyneth Paltrow, and it includes this quote about Rumi’s The Guest House and a book called Man’s Search for Meaning (by Holocaust survivor Viktor Frankl) that I read almost thirty years ago. (I don’t know too many Coldplay songs, but I do like Clocks.)

Listen with ears of tolerance, see through eyes of compassion

Listen with ears of tolerance.
See through the eyes of compassion.
Speak with the language of love.

~ Rumi

Any experience you have in samadhi you must try to attain in ordinary life

“As a general principle, any positive state that you experience within the context of silent sitting practice (when you reach the state of samadhi), you must try to attain in the midst of ordinary life.”

~ Shinzen Young’s teacher

Have you got any cookies? (Frank Burns in MASH)

“Have you got any cookies?”

~ Frank Burns, in M*A*S*H

Sometimes you just have to let people be wrong about you

In my experience, some “judgy” people will make up their own opinion about you — about what you should do or shouldn’t do — when they don’t know all the facts. I use the word judgy, because if you’re a Christian, Jesus was very clear on this point:

“Judge not, that ye not be judged.”

To wit, sometimes you just have to let people be wrong about you. (From this tweet by TinyBuddha.)

The Girl Who Loved to Dance

Some day I might write a book called, Random Conversations with Strangers While Aimlessly Wandering Around, and it will include stories like this:

Many years ago I walked into a favorite bakery in Alaska. Nobody was there, no customers or employees, so I took a few minutes to look over the cookies and donuts to decide what I wanted.

Finally a young woman came out of the back room. I knew from previous donut/cookie runs that she was born in Ohio, moved here about five years ago, was nineteen years old, and would be twenty in a few months. As she brought out a tray of something new, she said, “Oh, I’m sorry, I didn’t hear you come in.”

I replied it was no problem, it gave me a chance to think about what I wanted. We chatted for another minute or two and then she looked around and said, “Can I be honest with you?”

Life tv show: Did he ever have a head injury?

A funny moment from the tv series Life: “Did he ever have a head injury?”

The cabin in Talkeetna, Alaska

Every spring I think about moving back to Alaska. This is a photo of the cabin I lived in in Talkeetna, Alaska back in the day.

The park scene in the movie Starbuck

If you’ve never seen the movie Starbuck, it’s very good, and often very funny. This is one scene where a pregnant women is trying to come to grip with various feelings she is dealing with.

Scala sequences: head, tail, init, last (visual, image)

I just saw this drawing on the Learn You a Haskell website, and I wish I had done something visual like it for the Scala Cookbook. It does a nice job of showing the head, tail, init, and last functions (methods).

Peaceful Warrior: You need to ask better questions

A good line from a good movie.