Apple Swift New Programming Language for Mac & iOS Sen Ma - PowerPoint PPT Presentation

Apple Swift New Programming Language for Mac & iOS Sen Ma

Function patterns Protocols and extensions on structs Fast iteration Closures Generics Concise syntax Pattern matching Native collections Optional Types Operator overloading Object orientation Tuples Namespaces Type inference Clear mutability syntax Read-Eval-Print-Loop (REPL) Multiple return types Interactive playground Compile to native code

Fast Modern Safe Interactive

#include <iostream> using namespace std; � int main() { cout << "Hello World!" << endl; println("Hello World!") "Hello World!" return 0; }

goto pointers type casting uninitialized variables unsafe string formatting unclear copy / reference rules

Variables var name: type = "value" var version: Double = 1.0 var year: Int = 2014 var LanguageName: String = "Swift"

Constant variables let name: type = "value" let version: Double = 1.0 let year: Int = 2014 let LanguageName: String = "Swift"

Constant variables let name: type = "value" let version: Double = 1.0 let year: Int = 2014 let LanguageName: String = "Swift"

Constant variables let name = "value" let version = 1.0 let year = 2014 let LanguageName = "Swift"

Constant variables let name = "value" // Inference Type let version = 1.0 // Double let year = 2014 // Int let LanguageName = "Swift" // String let π = 3.1415926 // Double let 🐷 = "dog" // String

println let a=3, b=5 
 Output: 


println let a=3, b=5 
 println(a) 
 println(b) Output: 


println let a=3, b=5 
 println(a) 
 println(b) Output: 
 3 
 5

println let a=3, b=5 
 println(a) 
 println(b) Output: 
 3 
 5 
 3 times 5 is 8

println let a=3, b=5 
 println(a) 
 println(b) 
 println("\(a) times \(b) is \(a*b)") Output: 
 3 
 5 
 3 times 5 is 8

Demo

Loops for (var i=0; i<10; i++){ } var i=0; while (i<10){ println(i) i++; }

Loops - for in for ch in "mouse"{ println(ch) } Output: 
 m 
 o 
 u 
 s 
 e

Loops - for in for ch in " ⿏鼡标 "{ println(ch) } Output: 
 ⿏鼡 
 标

Loops - for in for ch in " 🐮🐮🐮🐮🐮 "{ println(ch) } Output: 
 🐮 
 🐮 
 🐮 
 🐮 
 🐮

Loops - for in - Range for num in 1…5{ println(num) } Output: 
 1 
 2 
 3 
 4 
 5

Loops - for in - Range for num in 0..<5{ println(num) } Output: 
 0 
 1 
 2 
 3 
 4

Demo

Array let array = [1, 2, 3, 4, 5] 
 Output: 



 Array let array = [1, 2, 3, 4, 5] 
 println(array) 
 Output: 


Array let array = [1, 2, 3, 4, 5] 
 println(array) 
 Output: 
 [1,2,3,4,5] 


Array let array = [1, 2, 3, 4, 5] 
 println(array) 
 println(array[1]) Output: 
 [1,2,3,4,5] 


Array let array = [1, 2, 3, 4, 5] 
 println(array) 
 println(array[1]) Output: 
 [1,2,3,4,5] 
 2

Array let array = [1, 2, 3, 4, 5] 
 for num in array{ 
 println(num) 
 } Output: 
 1 
 2 
 3 
 4 
 5


 Function func SayHello(){ 
 println("Hello") 
 } 
 SayHello() Output: 



 Function func SayHello(){ 
 println("Hello") 
 } 
 SayHello() Output: 
 Hello


 Function func SayHello(name: String){ 
 println("Hello \(name)") 
 } 
 SayHello("Sen Ma") Output: 
 Hello


 Function func SayHello(name: String){ 
 println("Hello \(name)") 
 } 
 SayHello("Sen Ma") Output: 
 Hello Sen Ma


 Function func SayHello(name: String)->String{ 
 return "Hello " + name 
 } 
 SayHello("Sen Ma") Output: 
 Hello Sen Ma

Demo