When preparing for a Swift Interview Questions, it is essential to be well-versed in the basics and some advanced topics of the language. Here are the top questions that freshers may encounter during a Swift interview, along with their answers.
Q1. What is Swift?
Ans: Swift is a powerful and intuitive programming language for macOS, iOS, watchOS, and tvOS. It is designed to work with Apple’s Cocoa and Cocoa Touch frameworks and is highly optimized for performance.
Q2. What are the advantages of Swift over Objective-C?
Ans: Swift offers numerous advantages over Objective-C, such as better readability, easier maintenance, safer type system, less code, and improved performance.
Q3. What are Optionals in Swift?
Ans: Optionals in Swift are used to represent a value that can either exist or be nil. They are declared using the ? symbol.
Q4. What is the difference between let and var in Swift?
Ans: let is used to declare constants, which means the value cannot be changed once set. var is used to declare variables that can be modified after initial assignment.
Q5. What is the difference between nil and null?
Ans: In Swift, nil represents the absence of a value for an optional. Swift does not use null; instead, it uses nil for optionals.
Q6. What is a Tuple in Swift?
Ans: A tuple is a group of multiple values combined into a single compound value. Tuples can contain values of different types.
Q7. Explain the guard statement in Swift.
Ans: The guard statement is used for early exit from a function, loop, or condition if a certain condition is not met. It helps in improving code readability and maintainability.
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