Scala, Java, Unix, MacOS tutorials (page 47)

The Scala 2.13 collections’ class updates 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

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:

A few years ago I had a party at my house, and there was a woman there that I didn’t know, but I felt like I knew her. To be clear, I knew that she worked with a group of people I had invited, but I didn’t know her. Yet, it was a strange feeling, a thousand miles past deja vu. Maybe I had seen her somewhere before, but I couldn’t place it.

When that thought came to me I was talking to some other people, so I shrugged it off for the time being. The party had just begun, 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 a detached garage. I put the bag in the can and turned around, only to be startled to see the woman standing there.

“How do I know you,” she asked.

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. Maybe you see things 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 FAQ: How do I view the detailed commit history for a file with git?

Solution: When you want the detailed git commit history for a file, this is the best git command I know: