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chrisaiv on 03/01/15

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SWIFT: Value & Reference Types

/ Published in: Objective C

Notes about reference types

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// Variables and CONSTANTS can reference two types of values: Values and Reference types

import Cocoa

var str = "Hello, playground"

/** ** ** ** ** ** ** ** ** **
Value Types
1: They only have a single reference to them.
2: Types of Objects: Structures, Enumerations, Tuples,
2: Assignment to value types results in a copy to the value.
** ** ** ** ** ** ** ** ** **/

/** ** ** ** ** ** ** ** ** ** 
Reference Types
1: They use a memory management model like objective C
2: Types of Objects: Classe and Functions
3: There are no copies of references types, only associations.
4: Assigning a var or let to a Class or Function only increases the reference count to the value. Assigment DOES NOT MAKE A NEW COPY OF THE VALUE
5: Single inheritance model
6: Supports Polymorphism
7: Supports Classes and Instances
8: Classes & instances can have their own methods
9: Classes & instances can have their own properties
** ** ** ** ** ** ** ** ** **/

class Person {
    var firstName:String
    var lastName:String
    
    init(firstName:String, lastName:String){
        self.firstName = firstName
        self.lastName  = lastName
    }
    
    func saySomething(message:String){
        println("\(firstName) \(lastName) says '\(message)'")
    }
    
    class func saySomething(message:String) {
        println("...and the people all say \(message)")
    }
}

//New Instance
let person = Person(firstName: "Chris", lastName: "Aiv")
    person.saySomething("HEllo World")

//Call class function
Person.saySomething("OH YAY")

func printPerson(p:Person){
        println("Person is \(p.firstName) \(p.lastName)")
}

let stooges = ["Larry", "Moe", "Curly"]
stooges.filter({
    (name:String) -> Bool in return name.hasPrefix("L")
})

/** ** ** ** ** ** ** ** ** ** 
Various ways to call a function
** ** ** ** ** ** ** ** ** **/

//func printperson(person:Person)

//func printPerson(person

/** ** ** ** ** ** ** ** ** **
Various ways to call a closure
** ** ** ** ** ** ** ** ** **/

//Explicit
stooges.filter({(name: String) -> Bool in
    return name.hasPrefix("L")
})

//Shorthand
stooges.filter({$0.hasPrefix("L")})

//Last argument in the class
stooges.filter() { name -> Bool in
    name.hasPrefix("L")
}

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