How to work with money in an accessible experience. Recently I've worked on a feature to add different accounts to a list. Each account could have its own currency. The first solution that comes to mind is to use an independent NumberFormatter for each account balance. Reasonable. Here we will…

Have you ever joined an existing project and inherit a legacy codebase, where you’ve found yourself lost in between the lines? Do these quotes mean anything to you — “This doesn’t make any sense” or “What in earth is this?”? That’s what we’ll gonna talk today. A few weeks ago…

Understanding what dispatching work synchronously and asynchronously means in iOS. The opposite of love is not hate, it’s indifference. The opposite of art is not ugliness, it’s indifference. The opposite of faith is not heresy, it’s indifference. And the opposite of life is not death, it’s indifference. – Elie Wiesel…

Testing synchronous and asynchronous algorithms with escaping closures — Here’s a charade: I have two functions. Can you tell which one is synchronous and which one is asynchronous? See below: func doThis(_ closure: () -> Void) { // … } func doThat(_ closure: @escaping () -> Void) { // … } That’s a silly question, I know. The answer…

Three friends of mine want to move to the technology industry and I’m helping them. They are coming from different backgrounds, so naturally it’s being challenging. I’ve been in tech for the past 14 years, and lately a good chunk of my time goes towards coaching and mentoring, so I…

Exploring the nonce and playing with the mining service. Before you dive in This article is part of the series "Building a Blockchain in Swift". You can find the intro here, and find the part 1 here. The nonce Now that we have our blockchain settled and we know how the blocks and transactions work, let’s…

Designing blocks, the chain, adding transactions and defining the consensus mechanism. Zoom out This article is part of the series "Building a Blockchain in Swift". You can find the intro here. Getting started I'll keep this very simple and straight to the point. If you want to clone the sample project, you can find…

A simple proof-of-work blockchain inspired by Bitcoin and built in Swift. This year was my debut year in blockchain and I'm coming here to share my excitement with you. One of the coolest things (in my opinion) about the blockchain is that it works in a distributed way and it…

How to effectively distribute and defer work from the foreground to the background. Previously, we had a good overview of how the Background Execution is handled after iOS 13. Now is time to get our hands on it. …