Swift Learning--enumeration

Swift Enumeration

1. Enumerating the basic syntax

enum Method {

Case Add

Case Sub

Case Mul

Case Div

}

You can also use a simpler notation.

enum method1{

case Add, div,mul,sub

}

2. Swift matches enumeration values

func Choosemethod (Op:method)-(double, double)->double {

Switch op {

//. ADD is actually method.add

case. ADD:

func Add (a:double, b:double)->double{

return A+b

}

return Add

case. Sub:

return {(a:double, b:D ouble), Double in return a-B}

case. Mul:

return {$ * $}

//Case. Div:

return {

(A:D ouble, b:D ouble)->double in

Return A/b

If you do not write the full case value, you must add the default, or the error

default:

return {

$ + $

}

}

}

Let val = Choosemethod (op:. DIV) (10, 131)

Print (val)

Swift Learning--enumeration