swift--function

1Func SayHello (personname:string)string//Return is a string type2 {3Let greeting ="Hello"+ PersonName +"!"4        returnGreeting5 }6 7println (SayHello ("Lin"))//hello lin!8 9Func Add (A:int, B:int),IntTen { One        returnA +b A } -  -println (Add ( -, -))//50 the  -Func process ()Float - { -        return 3* -; + } -  + println (Process ())//60 A  at Func method () - { -println"Hello World") - } - method ()//hello World -  in //returns more than one value -Func count (string: String),(Vowels:int, Consonants:int, Others:int) to { +         varvowels =0; -         varconsonants =0; the         varothers =0; *          forCinch string $         {Panax Notoginseng                SwitchString (c). lowercasestring -                { the                         Case "a","e","I","o","u": +++vowels; Cannot have space behind + + A                         Case "b","C","D","F","g","h","J","k","L","m","N","P","Q","R","s","T","v","W","x","y","Z": the++consonants +                        default: -++others $                 } $          } -          return(vowels, consonants,others) - } the  -Let total = count ("some arbitrary string!")Wuyiprintln"\ (total.vowels) vowels and \ (total.consonants) consonants")//6 vowels and consonants

1. Extended parameter name

1Func process (p1:string, p2:int)String2 {3         return "Name:"+ p1 +"Age :"+String (p2)4 }5println (Process ("Bill", -))//name:bill age:206 7Func Process1 (name p1:string, age p2:int)String8 {9          return "Name:"+ p1 +"Age :"+String (p2)Ten } Oneprintln (PROCESS1 (name:"Mike", Age: -))//name:mike age:17.
println (Process1 (age:17,name: "Mike")//This will be an error, said no name found, so this order must be strictly consistent.

2, internal parameter name and extension parameter name merged

1 func process2 (#name: String, #age: Int),string2{3      return  'name: ' ' Age :' + String (age)   4 }5 println (PROCESS2 (name:"BILL", Age:))

3. Default parameter values

1Func PROCESS3 (Name p1:string ="MIKE", Age P2:int = -),String2 {3Reutrn"Name:"+ p1 +"Age :"+String (p2)4 }5 6 println (PROCESS3 ())7println (PROCESS3 (name:"JOHN"))8 9Func process4 (name:string ="Mike", Age:int = -),StringTen { One        return "Name:"+ name +"Age :"+String (age) A } -  -println (PROCESS4 (name:"..."))//Although the preceding is defined with the internal parameter name, but because of the subsequent assignment operation, so the intrinsic parameters are implicitly converted to external parameters, if not add Name: will be an error. 

4. Variable parameters

5. Constants and Variable parameters

6. Input and OUTPUT parameters

7. Function type

8. Nested functions

swift--function