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Question-1. What is F#?
Answer-1: F# is a functional-first programming language designed for .NET and known for its succinct syntax and strong type system.
Question-2. What type of language is F#?
Answer-2: F# is a multi-paradigm language supporting functional, imperative, and object-oriented programming.
Question-3. How do you declare a variable in F#?
Answer-3: Use let. Example: let x = 10.
Question-4. What is the primary use case for F#?
Answer-4: F# is commonly used for data analysis, scientific computing, web development, and finance.
Question-5. How do you define a function in F#?
Answer-5: Use let. Example: let add x y = x + y.
Question-6. What is pattern matching in F#?
Answer-6: Pattern matching is a feature to match and decompose data structures.
Question-7. How do you write a match expression in F#?
Answer-7: Use match ... with. Example: `match x with
Question-8. What are immutable types in F#?
Answer-8: Immutable types cannot be changed after creation.
Question-9. How do you handle null values in F#?
Answer-9: F# avoids nulls by using the option type.
Question-10. What is the option type in F#?
Answer-10: option is a type that represents either Some(value) or None.
Question-11. What are discriminated unions in F#?
Answer-11: Discriminated unions define a type that can hold one of several named cases.
Question-12. How do you define a discriminated union in F#?
Answer-12: Example: `type Shape = Circle of float
Question-13. What is a tuple in F#?
Answer-13: A tuple is a collection of values grouped together. Example: (1, "hello", true).
Question-14. What are records in F#?
Answer-14: Records are immutable types that group related fields.
Question-15. How do you define a record in F#?
Answer-15: Example: type Person = { Name: string; Age: int }.
Question-16. What is an F# list?
Answer-16: A list is an immutable collection of elements. Example: [1; 2; 3].
Question-17. How do you define a list in F#?
Answer-17: Use square brackets with semicolons. Example: [1; 2; 3].
Question-18. What is a sequence in F#?
Answer-18: A sequence is a lazy, ordered collection of elements.
Question-19. How do you define a sequence in F#?
Answer-19: Use seq or sequence comprehensions. Example: seq { 1 .. 10 }.
Question-20. What are higher-order functions in F#?
Answer-20: Functions that take other functions as parameters or return them.
Question-21. How do you define a higher-order function in F#?
Answer-21: Example: let apply f x = f x.
Question-22. What is currying in F#?
Answer-22: Currying transforms a function with multiple arguments into a sequence of functions.
Question-23. How does F# handle async programming?
Answer-23: F# provides async workflows for asynchronous computations.
Question-24. How do you create an async workflow in F#?
Answer-24: Use async { ... }. Example: let task = async { return 42 }.
Question-25. What is type inference in F#?
Answer-25: Type inference allows F# to determine variable and function types automatically.
Question-26. What is a module in F#?
Answer-26: A module is a container for functions, types, and values.
Question-27. How do you define a module in F#?
Answer-27: Use module. Example: module Math = let add x y = x + y.
Question-28. What is an F# computation expression?
Answer-28: A computation expression is a way to define workflows.
Question-29. What is the use of the yield keyword in F#?
Answer-29: yield is used in computation expressions to return values.
Question-30. How do you define a mutable variable in F#?
Answer-30: Use let mutable. Example: let mutable x = 10.
Question-31. How do you update a mutable variable in F#?
Answer-31: Use <-. Example: x <- 20.
Question-32. What is the unit type in F#?
Answer-32: unit represents a type with a single value, (), similar to void in other languages.
Question-33. How does F# support object-oriented programming?
Answer-33: F# supports object-oriented features like classes, interfaces, and inheritance.
Question-34. How do you define a class in F#?
Answer-34: Example: type Person(name: string, age: int) = member this.Name = name.
Question-35. What are type providers in F#?
Answer-35: Type providers offer types based on external data sources at compile time.
Question-36. How do you use a type provider in F#?
Answer-36: Add a library like FSharp.Data and use it to access data. Example: JsonProvider
Question-37. What is the difference between F# lists and arrays?
Answer-37: Lists are immutable, while arrays are mutable and provide constant-time indexing.
Question-38. What is a pipeline operator in F#?
Answer-38: The pipeline operator (`
Question-39. How do you use the pipeline operator in F#?
Answer-39: Example: `5
Question-40. What is partial application in F#?
Answer-40: Partial application allows you to call a function with fewer arguments than it requires.
Question-41. How do you implement partial application in F#?
Answer-41: Example: let add x y = x + y then let addFive = add 5.
Question-42. What are active patterns in F#?
Answer-42: Active patterns allow custom decomposition and pattern matching.
Question-43. How do you define an active pattern in F#?
Answer-43: Use let. Example: `let (
Question-44. What is tail recursion in F#?
Answer-44: Tail recursion ensures recursive calls do not consume additional stack space.
Question-45. How do you ensure tail recursion in F#?
Answer-45: Ensure the recursive call is the last operation in the function.
Question-46. What are implicit conversions in F#?
Answer-46: F# avoids implicit conversions and enforces explicit type casting.
Question-47. How do you define an interface in F#?
Answer-47: Use type with interface. Example: type IShape = interface member Area: float.
Question-48. What is the use of the match keyword in F#?
Answer-48: The match keyword is used for pattern matching.
Question-49. How do you handle exceptions in F#?
Answer-49: Use try...with. Example: try ... with ex -> printfn "%s" ex.Message.
Question-50. What are inline functions in F#?
Answer-50: Inline functions are substituted at the call site to improve performance.
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