aainaj

import Foundation

class Product: NSObject {
    let identifier: Int

    init(identifier: Int) {
        self.identifier = identifier
        super.init()
    }
}

aainaj

/* syntax: 
 public func assert(
            _ condition: @autoclosure () -> Bool,
            _ message: @autoclosure () -> String = default,
            file: StaticString = #file,
            line: UInt = #line)
*/
let minAge = 2
assert(minAge >= 3, "Age did not meet expectation")

aainaj

/* syntax: 
  public func assertionFailure(
            _ message: @autoclosure () -> String = default,
            file: StaticString = #file,
            line: UInt = #line)
*/
guard age >= 3 else {
return assertionFailure("Age can't be less than 3")
}

aainaj

/* syntax:
        public func precondition(
            _ condition: @autoclosure () -> Bool,
            _ message: @autoclosure () -> String = default,
            file: StaticString = #file,
            line: UInt = #line)
*/
let minAge = 2
precondition(minAge >= 3, "Age did not meet expectation")

aainaj

/* syntax:
 public func preconditionFailure(
                _ message: @autoclosure () -> String = default,
                file: StaticString = #file,
                line: UInt = #line) -> Never
*/
func validateAge(age: Int) -> Bool {
        guard age >= 3 else {
            preconditionFailure("Age can't be less than 3")
        }

aainaj

/* syntax: 
       public func fatalError(
            _ message: @autoclosure () -> String = default,
            file: StaticString = #file,
            line: UInt = #line) -> Never
*/
func validateAge(age: Int) -> Bool {
        guard age >= 3 else {
            fatalError("Age can't be less than 3")
        }

aainaj

//: Playground - Closures

// Closure take no parameter and return nothing
let sayHello: () -> Void = {
    print("Hello")
}

sayHello()

// Closure take one parameter and return 1 parameter

aainaj

let digitsList = [1, 2, 3, 4, 5]

let sum = digitsList.reduce(0) { $0 + $1 }
print(sum)
// prints 15

aainaj

//: Playground - Closures
import Foundation

class CaptureList: NSObject {
    let digit = 5
    
    override init() {
        super.init()
        
        makeSquareOfValue { [digit] squareDigit in

aainaj

//: Playground - Closures
import Foundation

class CaptureList: NSObject {
    let digit = 5
    typealias onCompletionHandler = (Int) -> Void
    
    override init() {
        super.init()