Unlocking Mixins with Swift 5.9 Macros June 12, 2023
It's been a while since the last time I thought about traits and mixins in Swift, but the WWDC23 presentations about macros brought a lot of memories from those times...
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WWDC23 notes June 9, 2023
WWDC23 is over and as previous year I'm sharing my unedited notes from all the sessions I've watched.This year has been quite entertaining as the main focus has been on...
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Non-nominal types workaround for domain modeling March 9, 2023
One of the many things I love about working with The Composable Architecture is how it encourages the developer to focus on domain modeling. I think that properly designing the...
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An exploration of FormatStyle as a Dependency January 20, 2023
Buckle up. This is an adventurer journal while exploring what's the best way of exposing the new style of formatting APIs in Foundation. We will walk through the paths of...
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On the new Point-Free swift-dependencies library January 10, 2023
The folks at Point-Free have given us yet again a new tool to improve our Swift development: swift-dependencies, see their announcement. Let me show the journey I've been for the...
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Why you should care about the future of Memory Ownership in Swift January 9, 2023
I've been very excited about memory ownership improvements to come to Swift, and now that they seem to materialize, I needed to share it with you. Specially because I feel...
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Limit Swift Concurrency's cooperative pool December 30, 2022
One of the nice things about Swift Concurrency is its cooperative thread pool. When writting concurrent code you should not think about threads but is still good to know how...
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Fluent syntax extensions in Swift January 5, 2022
In the early days of Swift, one thing I really enjoyed was the focus on properties (bye-bye ivars!) and the unification of stored and computed property syntax. It became very...
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Unwrap Or Throw (or Die) January 4, 2022
Swift's Optional type is one of the biggest hits of the language. Mainly because it's opt-in. Everything is non-optional by default, which solves the old problem of having to deal...
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Experimenting with a Query Resolver System January 2, 2022
Sometimes some topic gets in my head and doesn't leave until I've gone far enough to satisfy my curiosity. Usually this ends up with me spending days writing some code...
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Building a Channel with Swift Concurrency Continuations December 25, 2021
Following Structured Concurrency was one of the best decisions Swift could have made when introducing concurrency into the language. The impact of that decision on all the code written with...
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Observe actions in The Composable Architecture December 3, 2021
One of the beautiful things about Pointfree's Composable Architecture is how you can start using it on a smaller part of your app. It makes it very easy to improve...
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Swift's default literal types December 2, 2021
Today I want to show you a rather obscure feature of Swift. You will learn a bit about Swift's type system, type inference and other nice powers that the language...
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The Matrix in SwiftUI November 20, 2021
Today I want to share a weekend experiment where I built the classic Matrix effect in SwiftUI. It all started after seeing this tweet of the effect implemented in Compose....
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The importance of cooperative cancellation June 13, 2021
One of the most important aspects to understand about Swift Concurrency is how cancellation of async tasks works. You may expect that when a task is cancelled, it immediately stops,...
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Make a Swift Package Collection with your favorites June 10, 2021
WWDC21 has brought many cool things and there is one that will facilitate a lot the creation of new projects with dependencies. Until now it was a bit of a...
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SwiftUI and Structured Concurrency June 9, 2021
We're just in the week of WWDC and it's clear that Swift's Concurrency it's the biggest topic that will change how we develop. I've been following its evolution for months...
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WWDC21 notes June 9, 2021
As last year I decided to share my unedited notes from the sessions I'm watching. The difference is that this time I've focued more on the topics and not on...
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Swift Concurrency Videos May 25, 2021
Swift is about to get its Concurrency features. Their development is going very well, with many proposals actively reviewed and a lot of the work already available in recent snapshots....
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SwiftUI read preference helper March 22, 2021
SwiftUI's layout system is very nice to get started with. Combining stacks and modifiers you can get very far very quickly, but at some point you will need to pass...
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Better Dictionary literals with Result Builders March 9, 2021
Swift is well known for its lean syntax that helps newcomers understand the code relatively quickly. But it's also a language with advanced and powerful features. Sometimes this makes part...
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Publish step to generate social images for your posts January 22, 2021
In this post I want to show you a little behind the curtain. As you may have noticed if you follow me on Twitter, recently the tweets with links to...
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ViewBuilder vs. AnyView January 17, 2021
One of the major benefits of SwiftUI is its amazing DSL. A feature that not only makes it nice to read but also makes it possible to use the type...
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SwiftUI views to images January 9, 2021
SwiftUI is an amazing tool to create all sorts of views in our applications. But many times we want that ease of use to generate graphics that can be used...
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How to update SwiftLint December 24, 2020
Having a good process to update your tools is very important, specially for those that affect directly your code. I've talked about how I update swiftformat and this post will...
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How do I update swiftformat December 20, 2020
Talking about how one updates a tool may seem a bit nonsensical, after all, what dificutlies can you have when updating a tool? Well, you would be surprised! But no,...
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Swift's Optional equitability October 27, 2020
Optional equitability is one of those aspects of Swift that seems simple at a first glance but that makes you stop and think twice when you encounter it in actual...
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How to capture a reference that doesn't exist yet October 19, 2020
Sometimes when writing Swift code you want to reference an instance before its creation. It's not a very common, which is why I'm writing this post so I can easily...
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The Dogma of Mocks and Protocols August 4, 2020
This post is a personal opinionated piece around unit testing and the dogmas of our industry. Be sure to come here with an open mind and respectul toughts. I will...
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Shared SwiftUI previews for prototyping June 15, 2020
The introduction of SwiftUI and previews changed completely my process of developing applications. Having such an easy way of quickly prototyping UI ideas affected the rest of my process. But...
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Swift where clause in generic contexts May 15, 2020
Swift type system is quite powerful and the where clause is a very important part of how developers interface with it. This keyword allows developers to constraint code to a...
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Synthesized Comparable conformance for enums May 12, 2020
Swift 5.3 comes with a nice addition for enums: it will synthesize the required implementation to conform to the Comparable protocol. This reduces a lot the boilerplate needed to make...
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SwiftUI macOS color picker May 4, 2020
A couple of weekends ago I was reading my Twitter timeline and I, don't know how, ended up in this old tweet."This isn't a Louie Mantia color."(That means it isn't...
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PointFree Composable Architecture showcase May 3, 2020
PointFree has released a library with their Composable Architecture and I've been showing it a little bit on livestreams and videos. This page wants to serve as an index and...
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Protocol extensions and subclasses April 29, 2020
Protocol extensions are one of the most powerful features in Swift, but they also come with a bit of danger. In this post I will explore how this feature interacts...
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Road to Swift 6 video February 12, 2020
I shared a very special video on my Following Swift Evolution video series the other day, Road to Swift 6! I think it's an important moment to look at what...
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GitHub Actions for your Swift Package January 11, 2020
With the release Xcode 11 is now easier than ever before to work with the Swift Package manager. If I enjoyed making CLI tools with Swift before, now it's a...
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SwiftUI, list with indices without enumerated January 4, 2020
One of the common things we want to display with SwiftUI are lists of our models. The basics of it are pretty easy, you just need to use a ForEach...
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Improving SwiftUI modal presentation API June 24, 2019
SwiftUI has some presentation modifiers to display alerts, sheets and full screen views. On one hand, presenting an alert is nice and easy, it feels really well designed. But on...
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SwiftUI reusable Button style June 22, 2019
In my previous post about SwiftUI buttons I described a technique to reuse button configuration with a ViewModifier. Now that beta 2 is out, we finally have the proper tools...
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SwiftUI TupleView and equally spaced stacks June 13, 2019
Yesterday I shared with you a post where I was trying to understand SwiftUI's layout system in order to implement equally spaced distribution for views inside stacks.I was able to...
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Trying to understand custom layouts in SwiftUI June 12, 2019
One of the things that I still don't fully understand about SwiftUI is how to customise the layout of views.HStack and VStack are fine for the majority of cases, but...
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Playing with SwiftUI Buttons June 11, 2019
The abstractions on SwiftUI are so composable that customising the UI it's basically an intrinsic property of the framework. Let's take a quick look at some things you can do...
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First days with SwiftUI June 10, 2019
WWDC'19 has been great and I'm obviously hyper excited about SwiftUI but if there is one thing that I like more than watching a great announcement is watching great video...
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Apple listens to the community June 9, 2019
After all the game changing announcements on the WWDC one of the words that is used a lot is "finally!". We're excited and happy that Apple as finally given us...
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WWDC'19 marks the start of a new era June 8, 2019
WWDC '19 is over, and what a week! Let me start by saying that this is probably the best WWDC ever. We have seen the announcement of game changing technologies...
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Swift script to export lists from Reminders.app May 8, 2019
I've already mentioned how I moved tasks from Todoist to Bear but one of the missing pieces of the migration was some lists that I had on Reminders.These lists were...
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Property Delegates and the diligent community April 25, 2019
The Property Delegates proposal has been in review for some days by now and is a good example of the strength of the Swift community.This is a feature that many...
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Implementing using in Swift with SwiftSyntax April 22, 2019
Last year I wrote about Improving struct composition in Swift by levering the using keyword and feature taken from Jai. Recently I've been inspired by pointfree to implement this feature...
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The fiasco of configuration objects April 20, 2019
There is this commonly followed programming rule that says that parameter lists must be short.Nobody wants to see a constructor with more than 2 arguments right?Right?Well, let me tell you...
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Using protocols to associate types April 10, 2019
Today I've used Protocols to make a generic function only accept a certain number of types. The interesting part is that the only thing the protocol has is an associatedtype,...
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Safe string example, Safe XML and URL April 7, 2019
After finalising the InterpolableLanguage protocol in the third part of this series we will finally put it to good use and show an example of this can be used on...
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Generalising Swift string interpolation April 6, 2019
In the first article of this series we made a safe string type that was safe to use but with a cumbersome API, and on the second article we made...
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Making String safe with interpolation March 24, 2019
In the previous article we made a safe string type that was safe to use but with a cumbersome API. In this part we will use new Swift 5 interpolation...
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Solving the String problem with Swift 5 March 17, 2019
The String problem is something that I've explored before, in my 2015 post Solving the Strings Problem in Swift. The solution back then was far from ideal as Swift was...
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Swift Collection's prefix for quick tests March 16, 2019
This is a small trick that I use when I'm writing a script in Swift that performs some operation in a large number of objects, usually files. More often than...
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Move your tasks From Todoist To Bear February 17, 2019
After having clear the requirements for a notes system and comparing different options I decided to give an honest try to Bear. Now, one of the first things I need...
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A RunLoop for your Swift script January 19, 2019
In the past few days the Swift community has been awoken again with the promise of a better way of using Swift for scripting, all thanks to swift-sh.I made a...
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Must watch NSSpain 2018 talks October 4, 2018
Everyone knows that NSSpain is one of my favourite conferences but sadly this year I haven't been able to assist. Luckily for me the recordings are already up so I...
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GroupBy with KeyPath in Swift 4 August 24, 2018
One of the best things of modern Swift is the introduction of KeyPath. It allows us to reference getters and setters as first class values in our code. With them...
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Swift 4.2 CaseIterable enums and UISegmentedControl, a practical example August 18, 2018
On 2014 I wrote a post about how to drive a UISegmentedControl with the new powerful Swift enums. Back then the major complain was that to get all the cases...
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The community decides what becomes oficial July 13, 2018
I was reading the Rust forums when I saw this post talking about an oficial Rust error crate. It reminded me about the discussions in the Swift forums about making...
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WWDC 18 session notes June 10, 2018
As every year after WWDC is time to sit down and watch the videos of the sessions! I wrote last year about How I watch the WWDC videos and this...
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Swift Forums embraces the community May 11, 2018
Today I woke up to receive great news for the Swift community. The Swift Forums now have a new section to talk about some community projects!On the post that I...
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Testing an RxSwift operator with TestScheduler March 10, 2018
RxTesting makes testing a custom Rx operator an enjoyable experience. Being able to fake time simplifies a lot the develpemnt of reactive code and helps on building confidence in the...
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How flatMapLatest cancels an API request February 28, 2018
How flatMapLatest cancels an API request? This is a common question that people has when they start learning about Rx. Specially since RxSwift has an example of this in the...
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Processing and p5 in Swift February 20, 2018
p5.js and the rest of Processing projects are an amazing way of making coding more accessible to everyone, allowing creative people to make interactive applications with ease and teachers to...
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Lox Swift interpreter finished February 11, 2018
One year ago I decided to start working on a Lox interpreter in Swift following Bob Nystrom's book Crafting Interpreters. Today I'm happy to say that the work has been...
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Improving Swift struct composition, inspired by Jai February 3, 2018
Today I was reading Composing types in Swift which showcases the different ways of composing the different types in Swift: structs, classes and enums. Is a good read, specially if...
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Hole Driven Development in Swift January 30, 2018
While programming with a static type system there are times when you write the definition of a function but you still don’t have any idea on how to implement it.func...
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New Swift forums and wishes for 2018 January 23, 2018
Swift forums are live! This is a great change that many of us have been waiting for a long time and that marks a new era for the Swift community....
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LambdaCast examples of functional programming in Swift January 16, 2018
I recently discovered the podcast LambdaCast, a really interesting podcast about functional programming with hosts that are at different points on the path to functional programming. This gives an interesting...
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Creating a Swift package with SPM January 13, 2018
Watch how I create and publish a library with Swift Package Manager for the first time!With the help of the command line tool is pretty easy. After creating a folder...
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Idiomatic Kotlin, in Swift December 18, 2017
In this post I'm gonna explore the talk Idiomatic Kotlin by Dimitry Jemerov. I'm gonna do it by showing how each of the topics the author talks about could be...
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Time tracking in plain text June 18, 2017
I've been always a big fan of productivity, time is gold. But funny enough, as many other people, we fall into the traps of being productive by just spending more...
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The Swift 3 Grand Migration March 10, 2017
Some days ago I finally merged one of the biggest Pull Request our team has seen, the migration of our codebase to Swift 3. I decided to write some words...
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Lox, expressions February 18, 2017
The chapter 5 of Crafting Interpreters has been published and after a first read I started writing some Swift code to continue my implementation of the interpreter. Here there are...
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Lox interpreter in Swift January 30, 2017
A couple of days ago I was reading Crafting Interpreters written by Bob Nystrom and it awoke my passion for programming languages so I decided to implement an interpreter for...
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JIRA reports with Swift January 28, 2017
One of the things I think is really important in any team is to keep track of the performance. Not to use it as ammo to blame individuals but to...
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Let If Flow, a talk about FRP October 15, 2016
Yesterday I gave a talk about Functional Reactive Programming to my coworkers at LifeWorks. At first, I wanted to give some insight about it to the Android team, as they...
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Swift 3, linked lists and sentinels October 1, 2016
I've always been a big fan of Linked Lists. Maybe is because it was one of the first data structures that I learn how to implement and they were my...
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Abusing mocks September 2, 2016
The post Mock yourself, not your tests immediately captured my attention just by saying "I feel like we abuse of them". As I've been having more and more the same...
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XcodeTopComment, modify or remove the top comment of a file June 25, 2016
One of the things that Apple released on WWDC was the official support for Xcode plugins. Although in a very limited way, is really nice to see Apple opening Xcode...
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UIViewController extension for keyboard avoidance, and the missing features of Swift June 10, 2016
Being able to conform to a protocol and automatically have the implementation that you need is really a game changer. Having trait like functionality is one of the most interesting...
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Using closures to simplify June 7, 2016
This is an update to an previous post about using blocks to simplify in Objective-C.Swift makes working with functions much enjoyable simplifying its syntax and, specially, closing the gap between...
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Poor man's hot reloading for Swift scripts June 5, 2016
The other day, while I was writing a Swift script, I added an option to make it run continuosly so it could be on a server doing its job without...
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It’s a trap! Catch OS signals in Swift. May 29, 2016
In the script that I was recently writing, from where the post “The state of Swift scripting” emerged, I found that when the scrip is interrupted (Ctrl + C in...
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The state of Swift scripting, writing the script May 28, 2016
This is the second part of my posts about the sate of scripting with Swift. In the previous post I wrote about what I expect from a language toolset when...
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The state of Swift scripting May 27, 2016
In the past few days I’ve spend some time writing a little script in Swift and I thought it was a good time to revisit the state of the Swift...
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Matt Gallagher on C-level performance in Swift May 24, 2016
Getting C-level performance in Swift for numerical algorithms is quirky but not particularly difficult. If you limit yourself to value types (no classes or existentials), use unsafe pointers and tuples...
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Not Swift by default May 19, 2016
I really recommend reading how Maxim made his FlatBuffer library 10 thousand times faster Swift.The interesting part is when he realized how much faster the C implementation was compared with...
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Quick and dirty debug timer May 3, 2016
For those occasions when you need to check something some state at regular intervals.Just drop this snippet at the top of your file:static dispatchsourcet timer; void DebugTimer(dispatchblockt block) { dispatchqueuet...
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Tales of my first contribution with Swift on the server April 27, 2016
The other day I had to work with some date formatting on iOS and Android and I end up using the great website. I immediately missed the option to change...
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Subjective objectivity April 23, 2016
Good analysis of the rejected Swift proposals by Chris.I can see why, yet still feel the opposite. This is one of those cases where we can hardly say anything objective...
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WindowCapture, screenshot windows with RxSwift January 28, 2016
A while ago I wondered how easy would be to make a screenshot of a window in OS X from another application using some system API. With that idea in...
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Rust Traits restriction December 28, 2015
From Rust Traits page:There’s one more restriction on implementing traits: either the trait, or the type you’re writing the impl for, must be defined by you. So, we could implement...
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Swift Typed Throws compared with Rust December 23, 2015
I was reading about Error Handling in Rust to have a better understanding of the implications of typed throws in Swift (thanks to David for the proposal). At the end...
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Functions are Functors December 21, 2015
We are used to treat closures as first class citizens in our code. Same goes to functions as they are interchangeable. But we often don’t think of them as actual...
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Some interesting proposals for Swift December 13, 2015
Since Swift was open sourced I've ben scanning trough the mailing lists and there has been some interesting proposals for the future of the language. There are other places were...
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Solving the Strings Problem in Swift December 5, 2015
In this post I try to port the type based solution to the strings problem ideas by Tom Moertel to Swift.I started this some days ago as an exercise to...
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Sometimes Swift library November 28, 2015
Sometimes is a small Swift library that makes it easy to run code... sometimes. Well, actually, just once.Sometimes.execute(key) { // This will run just once }It was highly inspired by...
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Brad Larson on using Swift for robotics November 7, 2015
I’ve been following the linked blog because I’m really interested in the usage of Swift in environments different from the typical Apps. And because using it for robotics seems pretty...
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Swift JSON mapping libraries October 28, 2015
Today I had to do a little research on the state of JSON mappers in Swift for a new project. I’ve been using a simple JSON library to help me...
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Swift Stack for fun September 4, 2015
The other day I had some spare time and I started exploring the idea of a Stack in Swift using protocols. For what? For fun.A Stack is a data structure...
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Swift as a good language to learn Software Development September 2, 2015
The author of the linked post gives some reasons on why Swift is a good language for an introduction to computer science class. I’m really interested in Swift being a...
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Dependency injection without frameworks August 25, 2015
This post is one of those ones that I’ve been wanting to write for a while. It was some days ago when, by coincidence, I was reading a post about...
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Photos framework with ReactiveCocoa August 19, 2015
In the last version of BWallpapers I added the ability to save the wallpaper to a specific Wallpaper album in the Photos app.You can use the Photos.framework to do that....
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Protocols in Swift, the ongoing discussion August 18, 2015
Protocols in Swift are really powerful thanks to be able to be generic and to protocol extensions. But there is some things that drive us nuts. Mainly the usage of...
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Why I prefer Swift over Javascript August 14, 2015
The other day while I was adding the ability to generate the protocol file to my Sketch plugin I took the opportunity to make a couple of changes to the...
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GroupBy in Swift 2.0 June 29, 2015
2018/08/23: A new version of this post is available. Using KeyPath to simplify the call site and reduce possible mistakes.A while ago when Swift came out I had the idea...
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This is not a Singleton June 28, 2015
From Wikipedia, Singleton in Software Engineering:In software engineering, the singleton pattern is a design pattern that restricts the instantiation of a class to one object. This is useful when exactly...
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Sam Soffes on Building Functional Apps June 27, 2015
I would like to talk about a video of a great talk that I really recommend. I’m really interested on the topic of sharing code between iOS and Mac because...
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The unexpected but convenience case of flatMap in Swift June 24, 2015
Yesterday night I found myself reading this code in GitHub for dictionary in array { - if let interaction = Interaction(dictionary: dictionary) { - interactions.append(interaction) -...
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Understanding Swift Protocol Extensions dispatching June 20, 2015
As I said on my Fist impressions on WWDC 2015 I was really excited for finally having traits in Swift, in form of Protocol extensions. After playing with them this...
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What I don’t like about the new Swift error handling model June 12, 2015
I mentioned the new Swift error handling in my WWDC first impressions post. And although it’s true that I still have not had the opportunity to use it in a...
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First impressions on WWDC 2015 June 9, 2015
Every year, after the WWDC I usually record a podcast episode talking about my feelings of the keynote. This year I've been keeping a list of the things that I...
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Exploring Swift generic functions with WallpapersKit May 31, 2015
Today I’ve been updating BingWallpapers to use the last version of Swift and also include the latest changes of WallpapersKit, the framework that is shared across the Mac and iOS...
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Swift script to download Youtube videos from Safari Reading List March 28, 2015
When I wrote my srly script I thought on doing it in Swift, but at the end I decided to go with a well known scripting language, Ruby.After Ayaka’s talk...
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Type Systems and Domain Driven Development February 10, 2015
If you like this post I recommend you to read a more recent article about the same topic: Solving the String problem with Swift 5.Some days ago I read this...
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Objective-C keeps improving February 9, 2015
Yes, the title is not wrong. Apple just released Xcode 6.3 beta that includes multiple huge improvements to Swift 1.2 solving a lot of concerns that we all had. But...
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Wait for async code in a Swift playground September 8, 2014
By default a Swift playground stops it's execution when the top level function finishes. If you want to run async code you will never see the results. The system doesn't...
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Scripting helpers for Swift September 7, 2014
One of the most exciting things in Swift is the possibility to write and run scripts. It turns out that writing scripts is one of the best ways to learn...
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I want Headers in Swift September 6, 2014
People say that languages with headers are things from the past, but I still think that they are really useful. As I said before, we don't have to make a...
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I'm not the only one that wants traits in Swift September 2, 2014
Matt talks on NSHipster about default protocol implementations. I already said that it's a feature that I miss in Siwft (and in Objective-C). I'd never saw any big talk about...
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Understanding Value and Reference Types in Swift August 30, 2014
One of the coolest parts about Swift is how powerful all the types are. Structs are not like basic C structs, they have a lot of similarities with classes, and...
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Swift as the next web programming language August 29, 2014
Crhis give us some cool ideas for open source projects in Siwft. A web framework (like Rails or like Sinatra). Some people have already been experimenting in this direction. Since I...
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Swift extensions and inheritance August 27, 2014
This is another thing about extensions that I was not expecting. The other day while implementing Jlaner I had some problems with extensions.The problem is that you can't overwrite methods...
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Swift protocols are not Objective-C protocols August 26, 2014
For now, the Siwft and Objective-C protocols are two diferent things. The biggest differences is that Swift protocols can have structs and enums and can be adopted by value types.This...
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A Set Type in Swift August 22, 2014
Nate Cook writed afull featured Set Type in Swift. This are the things that I really like about some languages. The ability to extend the language itself with its own tools....
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Oficial answer to Protected acces control in Swift August 20, 2014
The oficial Swift blog is giving us clarifications about Access Control and protected It seems like it's their conscious decision to make an horizontal access control system instead of a vertical...
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Dan Ingalls: Object-Oriented Programming August 17, 2014
Really interesting talk about Object-Oriented Programming in a time when I wasn't even born! It´s really amazing how the tools that I use every day were created so many years...
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I love named parameters! August 12, 2014
This is a case of direct translation from Objective-C methods that don’t really look right in swift. The reason this works is swift’s external parameter names, which I think...
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Swift alternatives to protected August 7, 2014
Yesterday I made a question about the acces controls that we have in Swift: Why internal and no protected? There was not a really good answer in the social networks and...
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Why internal and no protected? August 6, 2014
This is a question that I have in my mind since Apple introduced the access modifiers. Why we want internal and not protected? The thing is that when I'm creating or...
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Thoughts after knowing Swift August 4, 2014
In these weeks, since Apple has announced his new programming language, I've been trying to learn something about it. As I said before, my approach hasn't been a full change...
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Instance Methods are Curried Functions in Swift – Ole Begemann July 29, 2014
So at the end Swift is more functional than we firstly thought :)...
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Swift enums and UISegmentedControl July 24, 2014
2018/08/18: Swift 4.2 introduces automatic synthesis of enum values. Check out the new version of this post. 2016/09/29: Updated for Swift 3.One of the most cool features in Swift are...
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Swift continues changing July 23, 2014
Yesterday Apple released the new beta4 with new changes in the Swift language. The big thing is the new acces control with three acces levels (private, internal and public). This...
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The power of clousures in Swift July 22, 2014
I really like when a language gives the power to extend it easily. In Swift the clousures are really powerful. You can use clousures to do lazyness and implement the while...