Swift
Closures in Swift
Closures are self-contained blocks of functionality that can be passed around and used in your code. Closures in Swift are similar to blocks in C and Objective-C and to lambdas in other programming languages.
Closures can capture and store references to any constants and variables from the context in which they are defined. This is known as closing over those constants and variables. Swift handles all of the memory management of capturing for you.
NOTE
Don’t worry if you are not familiar with the concept of capturing. It is explained in detail below in Capturing Values.
chris
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Dec 30, 2020