Scientific breakthrough of the afternoon

Property observers in Swift 4

The willSet observer seems to be as passive as the name suggests, unlike didSet:

class Eudaimonia {
    var aretē = 0 {
        willSet {
            print("Setting 'aretē' (= \(aretē)) to \(newValue).")

// You can try setting…

Sending password reset email after user has been created with Firebase Admin SDK (Node.js)

JavaScript example of an (endo)functor that is not the identity functor

or Functors in cathegory theory vs in functional programming

(The examples and most of the definition itself is taken from Jared Smith’s…

Rational behind `guard` (vs `if`)

guards allow to fail fast/return early and make checks more readable and more composable than using ifs.

1. Avoid “pyramid of doom”

Instead of

if let a = optionalA {
   if let…

The importance of repeating mistakes for learning

… or reinventing the wheel for that matter

This post is a note to myself, but I would appreciate any comments (correction, advice, suggestions etc.). Thank you!