This is JS (and) Crafting #11 - December 18th, 2023. Every Monday you will receive a hand-selected collection of links about JavaScript and how to craft better software.
seen formatting and first type annotations in part 3, now lets get a bit more concrete with tuples real data structures ftw
Taking in the rear view mirror for the first time and trying to sum up what I learned from ReScript and compare it to my initial expectations.
The setup is working, I can compile and run ReScript files, I touched a bit on the syntax in Part 2, next I will continue through the docs chapters from top to bottom.
In Part 1 I started with ReScript, I set up a project
and made my first steps, got it running.
Now I want to learn more and get to the point where I have a feeling for how to use ReScript, lets see where it takes me. I guess it will take me more than this "Part 2" post to be comfortable to start a project with ReScript.
Finally I am taking the time to learn ReScript. Follow me on my journey and read how I approach it, mixed with some of my opinions and experiences.
Coming across "unary operators" might happen in JavaScript, or (m)any other programming language(s). A couple examples for what is a "unary operator".
In JavaScript you may find: +1, -42, + "1", !true, delete x. All those are unary operators as you can also read on
MDN
and in the
spec. But what does the "unary" really mean?
And why is 1 + 1 not using a unary operator?
Actually Sir Tim Berners-Lee put the headline "Answers for Young People" above this article, but this is by far not only for the younger people. I can highly recommend to read it.
I renamed the series to "ML for VRT" instead of "ML vs. VRT" since that is what I actually want to achieve (eventually), as you can read in Part 1 - Machine Learning vs. Screenshot Comparing?. Read on to figure out how I ended up next to learn about neural networks, because I figured out just applying some code examples learned from tutorials won't suffice my learning and they won't answer the questions I actually have to understand how to tune a neural network to do what I image it to do, detecting screenshots for visual regression testing.
Below, I use the aliases grid-template-rows and grid-template-columns for grid-template:
Finally I need a CSS grid. Here is my intro to it. If you prefer a video this one (28 minutes) explains grid basics very well. But before learning CSS grid, I need to answer the question if I need it. I know flexbox quite ok, so why not use flexbox.
process.cpuUsage and process.memoryUsage
Learning stuff about nodejs (or v8) while writing tests that ensure runtime behaviour, using process.cpuUsage and process.memoryUsage. Curious how brittle those tests become over time. Glad the app ALWAYS runs in the same docker container (dev and prod).
Let us talk about mentorship.
I just wanted to install a github-flavored markdown plugin for vim. Until today I only used vim as it falls out of the box. So I had to do a couple detours before I got a vim plugin installed. Since I like the simplicity of the Mikado Method I apply it very often (maybe too often). In this case I used a very simple form of it, actually mainly to document all the steps I had to take on this detour. Read more below.
The callback-hell times are long over. We have better tools now. But which of the new kids on the block do you want to play with? In this meetup, last night we tried out async functions, also known by the name "async/await". It was a fun learning experience. Keep reading and get inspired.
In Ruby "and and or are control flow operators, not boolean operators".
In the ruby koans I now came across array functions. One is collect and I thought, this is map, and the comment below said
This article about closures in ruby started somewhere by saying "Ruby has four different ways of using closures, each of which is a tad bit different, and sometimes nonsensical".
I know that the calling of functions can be quite noise-less, no parantheses and commas. But it also leaves me baffled at times. I can't get my head around this one either.
One method three different return types