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alvin alexander favorite books categories alaska (25) android (138) best practices (63) career (50) colorado (21) cvs (27) design (33) drupal (120) eclipse (6) funny (3) gadgets (108) git (15) intellij (4) java (429) jdbc (26) swing (74) jsp (9) latex (26) linux/unix (289) mac os x (315) mysql (54) ooa/ood (11) perl (156) php (97) postgresql (17) programming (43) ruby (56) scala (640) sencha (23) servlets (10) technology (84) testing (13) uml (24) zen (47) Scala, Java, Unix, MacOS tutorials (page 1) A Zen Classic Zen Master Raven Functional Programming, Simplified My book, Functional Programming, Simplified — 4.5-star rated on Amazon, and their 6th-best selling functional programming book, and 5-star rated on Gumroad.com — is currently on sale in three formats: PDF Format $15 (sale!) on Gumroad.com Paperback Book Now $34.99 on Amazon Kindle eBook $14.99 on Amazon Scala 2.13’s ‘pipe’ and ‘tap’ chaining operations Scala 2.13 introduced two new “chaining operations” named pipe and tap . Here’s a quick look at how they work, plus a little extra fun at the end. pipe pipe works like a Unix pipe, passing values to functions. For example, given this setup: import scala.util.chaining._ import scala.language.implicitConversions def plus1(i: Int) = i + 1 def double(i: Int) = i * 2 def square(i: Int) = i * i // we’ll use this one later Sleep paralysis, hypnagogic hallucinations, and hypnopompic hallucinations (no, you’re not crazy) As a brief note today, for the last year or so I’ve been experiencing various “visions” when I wake up at night. I mentioned them to a doctor recently, and he said, “No, you’re not crazy, they’re referred to as hypnagogic hallucinations .” I found out that more accurately, the ones I’m experiencing are known as hypnopompic hallucinations . If you’re interested in what these look like, here are three that I experienced recently. I regularly see images of “splatter” on the ceiling, and they can be all sorts of color. Last night they were mostly black, but the night before that they were red and pink: “But I know you” Some time ago I was at a party, and there was a woman there that I didn’t know, but I felt like I knew her. It was a strange feeling, kind of like deja vu, but it had nothing to do with this party, just the feeling that I knew this woman. Maybe I had seen somewhere before, but I couldn’t place it. When that thought first came to me I was talking to some other people, so I shrugged it off for the time being. It was relatively early and I figured we’d meet soon enough. A little while later a trash can became full, so I took the bag out of the can and walked it to a garbage can outside by the detached garage. After I put the bag in the can outside I turned around, only to be startled to see the woman standing there. “How do I know you,” she asked. The time that mom told the police everyone was dead (a schizophrenia story) Imagine being 30 years old, and life is good. You’re healthy, vibrant, and even astonishingly good at math. But then just a few moments later you can’t make sense of the world. You don’t know what’s real and what’s not. You begin hearing voices that aren’t there. Shortly after this you’re put into a “mental institution.” That’s what happened to my mom. For whatever reason, shortly after I was born, she was stricken with schizophrenia . (If you’ve ever seen the tv series Fringe , my mom is almost exactly like Walter Bishop, or vice-versa.) Git: View the (detailed) commit history for a single file Git FAQ: How do I view the detailed commit history for a file? Solution: When you want the detailed git commit history for a file, this is the best git command I know: Rocky Mountain sunset, March 17, 2020 This is a sunset from my old apartment complex in Broomfield, Colorado, on March 17, 2020. This was going to be my office in Palmer, Alaska In 2011 I was living in Palmer, Alaska, and I just started to look into renting this small brown building to be a home for my software-consulting business when some family issues came up and I moved back to the Lower-48. There probably wasn’t enough work in the Palmer/Wasilla area — also known as the Mat-Su Valley — but I loved the area so much I wanted to give it a try. Rocky Mountain sunset A Rocky Mountain sunset, near Boulder, Colorado, November 24, 2016. Feeling like I have been drugged When I was very sick in 2015-2016, I used to tell my doctors it felt like I had been “drugged.” When I could see that they couldn’t understand or believe that, I’d tell them that it felt the way you feel after surgery, groggy and woozy. For the most of this year I’ve been eating very well, but yesterday I went to see a movie (Logan) and had some popcorn. Shortly after eating the popcorn I started to feel sick, and today I feel like I’ve been drugged. This — as I have learned — is life with mast cell activation disease, known as MCAD or MCAS . Louisville, Colorado: White trees on a cloudy day This is a photo of some white-tipped trees on a cloudy, overcast day in Louisville, Colorado, March, 2016 (a few miles east and south of Boulder, Colorado). Snowy trees, Louisville, Colorado This is a photo of some snowy trees in Louisville, Colorado, on March 27, 2018. I had to get up early to go to a physical therapy appointment and I was rewarded with this view. I’ve seen a lot of my friends lose their passion and end up in a rut “I’ve seen a lot of my friends lose their passion and end up in a rut, afraid to take a chance. ‘Night Moves’ is about romantic passion, but ‘ Ship of Fools ’ is about passion for life. Maybe a guy’s working a job he doesn’t like, and he sees an ad about the Alaska pipeline or something that excites him. But there are problems. His family says it’s too cold in Alaska or whatever. So he passes it up and just keeps on with something he hates.” ~ From Bob Seger, about his song, Ship of Fools SimpleTest, a simple “testing framework” for Scala For the purposes of writing the Scala Cookbook (2nd Edition) , I thought I wanted a little “testing framework.” At first when I tried to use existing frameworks, I found that they didn’t always work with the latest release of Scala 3.0 (formerly Dotty ). Then, after working with the libraries that were often kept up to date with Scala 3.0, I further decided that I just wanted to put my tests inside Scala @main methods — I didn’t want to have some code under src/main and other code under src/test in my Scala/sbt projects. So, in the end, I created my own testing “framework,” which I named SimpleTest . It’s really not a framework, it’s just a very little library that lets me run tests in @main methods. March, 2021 snowstorm (Longmont, Colorado) Over this past weekend, March 13-14, 2021, Denver, Colorado and the surrounding areas had the fourth or fifth largest snowstorm in recorded history. Before the snow stopped last night I saw that Denver had already had 24.1” of snow. This is a photo of my car and some neighbors cars here in Longmont, Colorado. The moon setting over the Rocky Mountains The moon setting over the Rocky Mountains at five o'clock this morning. ~ Broomfield, Colorado, March 13, 2014 “The Tree Holding The Moon Over The Rockies” The hospital was mostly empty yesterday morning (March 10, 2020). When I went to the Imaging Department, the technician was standing at the front desk waiting for me, his only patient. The grocery store was out of TP. But the Moonset around 6:45am was beautiful. A ZIO cheatsheet As a very brief introduction, this is the start of a ZIO cheat sheet. If you want a good cheat sheet, see this one on github . I’m creating my own as I learn ZIO and read the Zionomicon book . During the learning process I find that it’s much better to create your own by hand, that way you get something that’s meaningful to you. A Zen Classic Zen Master Raven Pagination ...