Swift blog posts, tutorials, tips, and tricks

How and when to use Lazy Collections in Swift

Lazy collections are similar to a regular collection but change the way how modifiers like map, filter, and reduce are ...
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• 5 min read Feb 23, 2021 Swift

How to use Variadic parameters in Swift

Variadic parameters make it possible to pass zero or more values of a specific type into a function. It can ...
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• 3 min read Feb 16, 2021 Swift

Result builders in Swift explained with code examples

Result builders in Swift allow you to build up a result using 'build blocks' lined up after each other. They ...
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• 8 min read Feb 09, 2021 Swift

XCTExpectFailure: Expected test failures explained with code examples

XCTExpectFailure was introduced in Xcode 12.5 and allows marking test failures as expected. The first time I read about this ...
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• 4 min read Feb 02, 2021 Swift

Lazy var in Swift explained with code examples

A lazy var is a property whose initial value is not calculated until the first time it's called. It's part ...
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• 4 min read Jan 25, 2021 Swift

Closures in Swift explained with Code Examples

Closures in Swift can be challenging to understand with types like trailing closures, capturing lists, and shorthand syntaxes. They're used ...
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• 5 min read Jan 19, 2021 Swift

What is a Computed Property in Swift?

Computed properties are part of a family of property types in Swift. Stored properties are the most common which save ...
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• 5 min read Jan 12, 2021 Swift

SwiftLee 2020 In Review: Most read blog posts

Every year I'm looking back at what I achieved with SwiftLee as well as what I want to achieve in ...
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• 5 min read Jan 05, 2021 Swift

Getting started with associated types in Swift Protocols

Associated types in Swift work closely together with protocols. You can literally see them as an associated type of a ...
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• 4 min read Dec 22, 2020 Swift

Result in Swift: Getting started with Code Examples

The Result enum is available since Swift 5 and allows us to define a success and failure case. The type ...
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• 5 min read Dec 15, 2020 Swift

Constraints in Core Data Entities explained

Constraints in Core Data are part of an entity configuration. Settings like the entity name and Spotlight display name might ...
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• 4 min read Oct 27, 2020 Core Data Swift

NSManagedObject events: handling state in Core Data

An NSManagedObject lifecycle goes from insertion and updates until deletion in the end. All those events come with their own ...
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• 4 min read Oct 20, 2020 Core Data Swift