"as" in Swift

概述逐条解释一下，熟悉 “as”的用法，是“as”，不是“as？”和 “as!”： for thing in things { switch thing { case 0 as Int: print("zero as an Int") case 0 as Double: print("zero as a Double") case l

逐条解释一下，熟悉 “as”的用法，是“as”，不是“as？”和 “as!”：

for thing in things {    switch thing {    case 0 as Int:        print("zero as an Int")    case 0 as Double:        print("zero as a Double")    case let someInt as Int:        print("an integer value of \(someInt)")    case let someDouble as Double where someDouble > 0:        print("a positive double value of \(someDouble)")    case is Double:        print("some other double value that I donot want to print")    case let someString as String:        print("a string value of \"\(someString)\"")    case let (x,y) as (Double,Double):        print("an (x,y) point at \(x),\(y)")    case let movIE as MovIE:        print("a movIE called \(movIE.name),dir.\(movIE.director)")    case let stringConverter as (String) -> String:        print(stringConverter("Michael"))    default:        print("something else")    }}

(1) 0 as Int(2) 0 as Double

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