What is swift?
An open source programming language from Apple that is easy to learn and implement. It can be used to write applications for OS X, iOS, and watchOS.
Swift Interview Questions: Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. for iOS, iPadOS, macOS, watchOS, tvOS, Linux, and z/OS. Swift is designed to work with Apple’s Cocoa and Cocoa Touch frameworks and the large body of existing Objective-C code written for Apple products.
In January 2017, Chris Lattner announced his departure from Apple for a new position with Tesla Motors, with the Swift project lead role going to team veteran Ted Kremenek.
During WWDC 2019, Apple announced SwiftUI, which provides a framework for declarative UI structure design across all Apple platforms.
While appearing for your interview, present yourself gracefully and take time to figure out and plan the answers before you speak. In case you have any doubts about a question, ask the interviewer instead of beating around the bush.
Be confident and approach the day with an optimistic outlook. You are sure to crack the interview.
All the best!
| Language paradigms: | Compiled language |
| Parent language: | Objective-C |
| Released : | 2014 |
Swift Interview Questions, Main Features of Swift?
- Closure Support
- String support
- Access control
- Optional and chaining
- Value types
- Protocol-oriented programming
- Libraries, runtime and development
- Memory management
- Debugging and other elements
- Performance
How are functions different from methods?
A function is defined as self-contained code that performs a specific task and although methods are intended for the same purpose, they are belong to classes, structs, and enums whereas functions do not.
How can you write a multiple line comment in swift?
Multi line comments are opened by a forward slash that is followed by an asterisk and then a colon. It is then closed by an asterisk that should be followed by a forward slash.? Multiline comments are used by programmers when they need to comment out large blocks of code.
/* This is a multiline comment. After you write multiline comment add * following by / to end it */
State two differences between Objective C and Swift?
Whereas it is necessary to complete a line of code using a semi colon in Objective C, this won’t be necessary in Swift.
The learning curve of Objective C is longer than that of Swift.
What is initialization in Swift?
Initialization is the process of creating an object, enumeration, or structure. The users sets an initial value for an existing property and then initializes it before a new instance becomes available for use.
What are floating point numbers and how many are available in the Swift programming language?
Floating point numbers have a fractional component implying that they define a larger range of values than integer types. There are two types of floating point numbers that are namely double and float. Double represents a 64-bit floating point number while float defines a 32 bit floating point number.
Swift Interview Questions, What are lazy stored properties?
This points out to any property whose initial value is not calculated until the first time it is used. They are useful when a property initial value is dependent on external factors whose values are unknown.
What is the Name a few characteristics of switch?
- When a case is matched, a program exits from switch and does not continue to check.
- A switch supports all kinds of data and checks for equality.
- Switch statements must be exhaustive and additionally, it must cover all possible values for the variable.
How many access levels are there in Swift?
There are five access levels that are namely:-
- Open access
- Public access
- Internal access
- File private access
- Private access
What is tuple?
A group of values that are represented as one value. They can be used to return multiple values from a single function call. There are two types of tuples that are namely named and unnamed tuples.
