iOS Interview Preparation Questions and Solutions

 iOS Interview Preparation Questions and Solutions

100 + Que/Ans Series , I will post a continue series on iOS Interview questions from a basic concept to advance .If you want to be updated of this series , go through this link or check comment section of this Article . “You will get answer for given question in first few line , and after that there will be some insights and key points about that question .”

Quick Note_ : If you want to be updated of this series , go through this _link __or check comment section of this Article .

“You will get answer for given question in first few line , and after that there will be some insights and key points about that question .”

1. What is Type Inference ?

In short its an ability of swift . You dont always need to write types of variables and constant you making in your code . For example :

// swift know its Int type
var age = 40 // Int 
// You dont need to tell them always like below
var age : Int = 40 

2. What is Generics ?

Generic code enables you to write flexible, reusable functions and types that can work with any type, subject to requirements that you define.

Understanding it with an example :

100 + Que/Ans Series , I will post a continue series on iOS Interview questions from a basic concept to advance .

Suppose you want to swap to values of type Int , lets write a non-generic functions :

func swapTwoInts(_ a: inout Int, _ b: inout Int) {
    let temporaryA = a
    a = b
    b = temporaryA
}
var num1 = 4
var num2 = 5
swapTwoInts(&num1 , &num2)

Now , suppose you want to swap two double values or two string values , you will need to write another function for that , because the above function is accepting only for Int type .

interview-questions ios interview programming swift

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