O'Reilly logo

Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Closures

Closures are self-contained blocks of code that provide a specific functionality and can be stored, passed around, and used in the code. Closures are the equivalent of blocks in C and Objective-C. Closures can capture and store references to any constants and variables from the context in which they are defined. Nested functions are special cases of closures.

Closures are reference types that can be stored as variables, constants, and type aliases. They can be passed to and returned from functions.

The following examples present different declarations of closures in Swift from the website, http://goshdarnclosuresyntax.com:

// As a variable: var closureName: (parameterTypes) -> (returnType) //As a type alias: typealias closureType ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required