# Programming in Swift: Functions & Types

Jan 4 2022 Swift 5.5, iOS 15, Xcode 13

## Part 2: 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
)
``````