Programming in Swift: Functions & Types

Jan 4 2022 Swift 5.5, iOS 15, Xcode 13

Part 2: Closures

10. Closures

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Previous episode: 9. Introduction Next episode: 11. Challenge: Closures

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Update Notes: This course was originally recorded in 2019. It has been reviewed and all content and materials updated as of October 2021.

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As I said, closures and functions are really just different flavors of the same thing. Actually, technically, functions are a special type of closure!

var operate = add

add(number1: 7, number2: 3)

operate(7, 3)

var addClosure

var addClosure😺: (Int, Int) -> Int

var addClosure: 😺Operate

var addClosure: Operate 😺= {

}

var addClosure: Operate = { 😺(a: Int, b: Int)

var addClosure: Operate = { (a: Int, b: Int) 😺-> Int

var addClosure: Operate = { (a: Int, b: Int) -> Int 😺in

return a + b

❌return❌ a + b

var addClosure❌: Operate❌ = 

addClosure(7, 3)

var addClosure = { (😺num1 a: Int, 😺num2 b: Int) -> Int in

var addClosure = { (a: Int, b: Int😺 = 10🛑) -> Int in

printResult(add, 4, 5)

printResult(operate, 4, 5)

printResult(addClosure, 4, 5)

printResult(+, 4, 5)

printResult(operate: (Int, Int) -> Int, a: Int, b: Int)

printResult(
  { 

  }...

  (a: Int, b: Int)

  (a: Int, b: Int) 😺-> Int

  (a: Int, b: Int) -> Int 😺in

    a * b  + 100

    a * b + 100
  }, 
  3, 10
)