Swift 2.0泛型例子解答

Question

func anyCommonElements (lhs: T, _ rhs: U) -> Bool {
for lhsItem in lhs {
for rhsItem in rhs {
if lhsItem == rhsItem {
return true
}
}
}
return false
}
anyCommonElements([1, 2, 3], [3])

练习： 修改anyCommonElements(_:_:)函数来创建一个函数，返回一个数组，内容是两个序列的共有元素。

Answer 1

 func anyCommonElements  (lhs: T, rhs: U) -> Bool { 
    for lhsItem in lhs { 
        for rhsItem in rhs { 
            if lhsItem == rhsItem { 
                return true 
            } 
        } 
    } 

    return false 
} 

anyCommonElements([1, 2, 3], [3]) 

func whichCommonElements  (lhs: T, rhs: U) -> Array { 
    var toReturn = Array() 

    for lhsItem in lhs { 
        for rhsItem in rhs { 
            if lhsItem == rhsItem { 
                toReturn.append(lhsItem) 
            } 
        } 
    } 

    return toReturn 
} 

whichCommonElements([1, 2, 3], [3, 2])