[SwiftPH + PADC Meetup - May 2019] Swift Kotlin Feature Comparison by Mac Valmores About the speaker: Currently leading, PADC and KotlinPH. A lead mobile developer in TEravibe Inc. addicted to board games. About SwiftPH: SwiftPH and iOSCodersPH are the Apple Developer Communities in the Philippines. SwiftPH is responsible for our meetups and the iOSCodersPH is our slack group. Our community aims to bring all the iOS (and Apple) developer in the Philippines together to learn from one another and help our Apple developer ecosystem grow. If you are interested, join us at https://meetup.com/swiftph. You can also reach out to us at swiftphofficial@gmail.com. About Philippine Android Developer Community (PADC): Philippine Android Developer Community is the Android developer community in the Philippines. (https://www.meetup.com/Philippine-Android-Developers-Community) About the event: Date: May 18, 2019 Venue: BeautyMNL, Philippines More info here: https://www.meetup.com/SwiftPH/events/261166657/

1. Comparison

2. • NO ‘;’
• Filename does not need to be Class name
• main runnable does need to be in a Class
• Super Class is “ANY” like Object
• All classes are final
• guards
Kotlin x Swift

3. DataTypes
int Int
toByte(): Byte
toShort(): Short
toInt(): Int
toLong(): Long
toFloat(): Float
toDouble(): Double
toChar(): Char
Type conversion

4. Permissions
info.plist Manifest.xml
Code

5. Interoperability
JS, C, JAVAC#

6. ReferenceTypes
var person = Person("Marco", "Valmores")
println(">> " + person.fullName)
var newperson = person
newperson.firstName = "Koin"
print(">> $person.firstName == $newperson.firstName)

7. Layout
Interface builder xml

8. Threading
let queue = DispatchQueue(label : “current queue”)
queue.async{
self.doWork()
}
DispatchQueue.main.async{
self.view.backgroundColor = .black
}

9. Threading
val c = AtomicLong()
for (i in 1..1_000_000L)
thread(start = true) {
c.addAndGet(i)
}
println(c.get())
val c = AtomicLong()
for (i in 1..1_000_000L)
GlobalScope.launch {
c.addAndGet(i)
}
println(c.get())

10. Layouts
None xml

11. Context
None Automatic Reference
Counting

12. Garbage Collection
Concurrent Mark Sweep
Automatic Reference
Counting
var person = Person("Marco", "Valmores")
var newperson = person
person = Person()
newperson = Person()

13. Dependency Management
Gems
Carthage
Gradle

14. Thank you

15. History
2014
Introduced
2016
Swift 3
2017
Swift 4
2018
Swift 5

16. History
2011
Introduced
2014
Introduced to Android
2016
Class Support for
Android
Sharing code for JVM
and JS
2018
Kotlin 1.3
2019
Preferred Language
for Android

17. IDE
Integrated Development Environment

18. • NO ‘;’
• Filename does not need to be Class name
• main runnable does need to be in a Class
• Super Class is “ANY” like Object
Primer
fun main(args : Array<String>) {
}

19. [val var const] variable name : [data type] = value
Variables
val var const
single assignment multiple assignment Compile-Time Constants
val MILLION = 1_000_000
var cost : Float = 10.99f
var hex : Hexadecimals = 0xFF_12_34_AB
val input: String?
print("Enter something: ")
input = readLine()
print (input)

20. Variables
toByte(): Byte
toShort(): Short
toInt(): Int
toLong(): Long
toFloat(): Float
toDouble(): Double
toChar(): Char
val truth : Boolean? = null

21. Variables : Strings
val text = """
|The quick brown fox
|jumped over the fence.
""".trimMargin()

22. Collections : Array
var products = Array<Item>(2){
Item()
}
var item = Item()
item.name = "Motorola Razor"
item.cost = 600.00
products[0] = item
var discountItem = DiscountItem()
discountItem.name = "Nokia 3310"
discountItem.cost = 1000.0
products[1] = discountItem
item = Item()
item.name = "Smart Phone"
item.cost = 1.0
products = products.plus(item)
for(item in products){
println("${item.name} : ${item.cost}")
}

23. val thresholds = intArrayOf(10, 20, 30, 40, 50)
println("Average: ${thresholds.average()}")
println("Max: ${thresholds.max()}")
println("Count: ${thresholds.count()}")
println("Size: ${thresholds.size}")
println("Sum: ${thresholds.sum()}")
println("First: ${thresholds.first()}")
println("Last: ${thresholds.last()}")
println("Index: ${thresholds[0]} == ${thresholds.get(0)}")
println("Slice: ${thresholds.sliceArray(1..3)
.toHashSet()
.toString()}")
Collections : Array

24. Collections : Array
val it: Iterator<Int> = thresholds.iterator()
while (it.hasNext()) {
val e = it.next()
print("$e ")
}
for (i in 0 until thresholds.size) {
print("${thresholds[i]} ")
}

25. Collections : Array
val array = arrayOf(intArrayOf(1,2,3),
intArrayOf(10,20,30))
println("Index : ${array[0][1]}")

26. Collections
val products: ArrayList<Item> = ArrayList()
val products = listOf<Item>()
val products = setOf<Item>()

27. Looping
val locationslist
= listOf("Makati", "Manila", "Marikina")
for (index in stores.indices) {
println("item at $index is ${stores[index]}")
}
var index = 0
while (index < stores.size) {
println("item at $index is ${stores[index]}")
index++
}
for(location : String in stores){
println("Location : $location")
}

28. Ranges
for (counter in 1..5) {
print(x)
}
for (counter in 1..10 step 2) {
print(x)
}
for (counter in 30 downTo 1)
print("$counter ")

29. Ranges
for (character in 'a'..'k')
print("$character ")
(1..5).forEach(::println)
(1..5).reversed().forEach {
counter -> print("$counter ")
}

30. Functions
fun printReceipt() {
for(item : Item in items){
println("$item.name : ${item.Cost}")
}
}
fun removeItem(itemToBeRemoved : Item) : Unit{
for(item : Item in items){
if (item.name.equals(itemToBeRemoved.name)){
}
}
}

31. fun totalTax(totalCost : Double) : Double
= totalCost * tax;
fun totalCost() : Double {
var cost = 0.0
for(item : Item in items){
cost += item.cost
}
return cost
}
Functions

32. override fun toString() : String {
var result : String = ""
for(item : Item in items){
result += "${item.name} tttt
${item.cost} n"
}
return result
}
Functions

33. fun size() : Int?{
return items.size
}
Nullable

34. fun totalCost() : Double {
var cost = 0.0
for(item : Item in items){
if(item is DiscountItem){
cost += item.cost
- (item.cost * item.discount)
}else {
cost += item.cost
}
}
return cost
}
Type Checking

35. Control Flow : when
for (x in 0..100 step 2) {
when(x % 2){
0 -> println("Start : $x")
is Int -> println("Number : $x")
else -> print(".")
}
}

36. Control Flow : when
fun totalCost() : Double {
var cost = 0.0
for(item : Item in items){
when(item) {
is DiscountItem -> cost +=
item.cost –
item.cost * item.discount)
is SalesItem -> cost += item.cost
else -> cost= cost
}
}
return cost
}

37. Lambda
val locationslist
= listOf("Makati", "Manila", "Marikina“,
"Caloocan", "Quezon", "Pasig")
locationslist
.filter { it.startsWith("M") }
.sortedBy { it }
.map { it.toUpperCase() }
.forEach {
println(it)
}

38. Kotlin Interactive
ClassesConstructorInheritanceLazy
variablesData ClassesSingletons
FunctionsFunction TypesFunction
literalsExtensions
Delegates or InterfacesClosures or Lambda
Control StructuresIf elseIterationsSwitch
Statement

39. HistoryBasicsPlaygrounds vs. Main
functionDeclaring functionsSingle-expression
functionVariable declarationsNullableString
interpolations