Question 1

What is the difference between 'let' and 'var' in Swift?

Accepted Answer

let declares an immutable constant while var declares a mutable variable. A constant cannot be changed after declaration, but a variable can change value. Use let by default for safety and code clarity.

Question 2

Which data type is used to represent true or false in Swift?

Accepted Answer

The Bool type is used for boolean values true and false. It is a fundamental type in Swift used in conditionals to control execution flow. Other types serve different purposes: Int for integers, String for text, Boolean does not exist in Swift.

Question 3

What is type inference in Swift?

Accepted Answer

Type inference allows Swift to automatically deduce a variable's type from its initial value. For example, if you assign 42, Swift infers Int. If you assign text, Swift infers String. This makes code concise without losing type safety. You can annotate explicitly if needed.

Swift Basics

What is the difference between 'let' and 'var' in Swift?

Risposta

Which data type is used to represent true or false in Swift?

Risposta

What is type inference in Swift?

Risposta

What is an optional in Swift?

How do you safely unwrap an optional using 'if let'?

Altri argomenti di colloquio iOS

Swift Language Essentials

UIKit Fundamentals

UIViewController Lifecycle

UserDefaults & Keychain

Application Lifecycle

Auto Layout & Constraints

UITableView & UICollectionView

SwiftUI Basics

SwiftUI State Management

SwiftUI Navigation

Networking & URLSession

Codable & JSON Parsing

Core Data

Protocol Oriented Programming

MVVM Architecture

Push Notifications

Unit Testing & XCTest

UI Testing

Xcode & Build System

Swift Package Manager

Memory Management & ARC

Combine Framework

Concurrency & async/await

iOS Design Patterns

Performance Optimization

Security & Encryption

SwiftUI Advanced

iOS Application Architecture

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