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Interview questions

① gives an array that requires swift to write a function that swaps two elements in the array.

    //to an array that requires swift to write a function that swaps two elements in the array. var nums = [1,2,3,4,5,6,7]    //Func Swap (_ Nums:inout [Int], _ A:int, _ B:int) {//Let temp = Nums[a]//Nums[a] = nums[b]//Nums[b] = temp//        }        //2. Generics//Func swap<t> (_ Nums:inout [T], _ A:int, _ B:int) {//Let temp = Nums[a]//Nums[a] = nums[b]//Nums[b] = temp//        }    //Func swap<t>(_ Nums:inout [T], _ A:int, _ B:int) {Let Count=Nums.count//Safety Judgment        ifA = = B | | A <0|| A > Count-1|| b <0|| B > Count-1   {            return} (Nums[a],nums[b])=(Nums[b],nums[a])}

② Circular Reference

 //  Circular reference (pre-property +weak decoration)  class   Node {var value  = 0
     weak var prev:node ?  weak var next:node ?     init (_ Value:int) {self.value  = value} Deinit {print (  " deinit   " )}}let a  = Node (0  ) let b  = Node (1  " A.prev  = Bb.next  = a 

③ uses Swift to implement a function, input is any integer, output to return the input integer +2

Simple: Func addTwo (input:int)-Int {returnInput +2    }//What is the curry?//currying refers to the transformation from a multi-parameter function into a series of single-parameter functions.Func Add (Input:int), (INT)Int {return{Valueinch            returnInput +Value}} Let AddTwo= Add (Input:2) Let Oupput= AddTwo (8) print (oupput)classBankcard {//Balancevar balance:double =0.0        //How to save moneyfunc Deposit (amount:double) {balance+=Amount Print ("deposit:\ (balance)")        }            }//Curry?Let card =Bankcard () card.deposit (amount: -) Let deposit=bankcard.depositdeposit (Card) ( -)

④ Simplifying Code

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