turing complete with a stack of 0xdeadbeef

Writing by tag: closures

What type is self in a Swift self-executing anonymous closure used to initialize a stored property?

The answer might surprise you 22 December 2020
Updated: 02 March 2022

In JavaScript, this pattern is called an Immediately Invoked Function Expression (IIFE) or a Self-Executing Anonymous Function. Swift doesn’t have an “official” name for this, but IIFE works as well as “immediately executed anonymous closure” or “self-executing anonymous closure”. (Thanks to folks on Twitter for helping with this.)

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Why optional closures in Swift are escaping

10 June 2018

In a recent episode of the podcast, JP and I discussed the implicit escaping of closures in Swift. As Swift has matured and evolved, the default behavior of closure parameters in functions has changed. Prior to Swift 3, closures parameters were escaping by default. After SE-103, the default was changed to non-escaping.

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