Category: Programming

A big part of my work has to do with code. I’ve worked as system administrator – installing, patching, and configuring someone else’s code. I’ve worked as independent programmer, writing code on my own. I also programmed as part of the team. And on top of that, I worked as Team Leader and Project Manager, where I had to interact a lot with programmers. Programming world on its own is as huge as the universe. There is always something to learn. When I find something worthy or something that I understand enough to write about, I share it in this category.

The Rise Of The State Machines

“The Rise Of The State Machines” is a nice introductory article into the domain of process management and state machines.

A state machine is a mathematical model of computation. It’s an abstract concept whereby the machine can have different states, but at a given time fulfills only one of them. There are different types of state machines. The most famous one, I believe, is the Turing machine. It is an infinite state machine, which means that it can have a countless number of states. The Turing machine does not fit well in today’s UI development because in most cases we have a finite number of states. This is why finite state machines, such as Mealyand Moore, make more sense.

The difference between them is that the Moore machine changes its state based only on its previous state. Unfortunately, we have a lot of external factors, such as user interactions and network processes, which means that the Moore machine is not good enough for us either. What we are looking for is the Mealy machine. It has an initial state and then transitions to new states based on input and its current state.

There are quite a few JavaScript code examples and library references, illustrating the basic concepts and implementation.

Let’s Encrypt is leading Top SSL Issuers

Netrack reports some statistics for the Top SSL Issuers, and it’s nice to see Let’s Encrypt leading the race with a significant advantage over the rest. Well done, ladies and gentlemen!

You fired your top talent. I hope you’re happy.

“You fired your top talent. I hope you’re happy.” is a response to “We fired our top talent. Best decision we ever made.” article.  It’s one of the best things I’ve read all through last year.

GitHub GraphQL API v4

I’ve briefly mentioned before that GitHub joined the adopters of the GraphQL for their API.  Here’s the link to the full documentation and more details.

GitHub chose GraphQL for our API v4 because it offers significantly more flexibility for our integrators. The ability to define precisely the data you want—and only the data you want—is a powerful advantage over the REST API v3 endpoints. GraphQL lets you replace multiple REST requests with a single call to fetch the data you specify.

Defensive Programming : Object Calisthenics

I came across this nice and somewhat strongly opinionated video on Defensive Programming:

Marco Pivetta makes quite a few good points with I agree (and a few with which I disagree).  One thing that he mentioned though I haven’t heard about – Object Calisthenics.  Which turns out to be yet another set of rules and best practices for the object-oriented design and programming.  Here are the rules to get you started:

  1. Only One Level Of Indentation Per Method
  2. Don’t Use The ELSE Keyword
  3. Wrap All Primitives And Strings
  4. First Class Collections
  5. One Dot Per Line
  6. Don’t Abbreviate
  7. Keep All Entities Small
  8. No Classes With More Than Two Instance Variables
  9. No Getters/Setters/Properties

Read the whole article for explanations and examples.