Haskell & Functional Programming Concepts Questions
Haskell language fundamentals and functional programming concepts, including pure functions, immutability, higher-order functions, recursion, lazy evaluation, the type system and type classes, and core FP abstractions such as Functor, Applicative, and Monad (including monadic IO), along with common patterns and idioms used in Haskell programming.
EasyTechnical
0 practiced
Describe the IO monad in Haskell at a high level: what problem does it solve, and how does it preserve purity while enabling side effects? Give a simple example `main :: IO ()` that reads a line, reverses it, and prints it back.
EasyTechnical
0 practiced
Explain how the Haskell module system works: how do you export functions from a module, import qualified vs unqualified names, and avoid name clashes? Provide a sample module header that exports only selected functions and a usage example showing qualified import.
HardTechnical
0 practiced
Discuss Haskell's FFI for interoperating with C: how to call C functions, manage memory safely using `ForeignPtr`, and avoid common pitfalls (e.g., GC interactions, pointer invalidation). Provide a small example that calls a C function which fills a buffer and returns a length, showing safe marshalling.
MediumTechnical
0 practiced
Build a small parser for simple arithmetic expressions containing integers, `+` and `*`, and parentheses using Parsec or Megaparsec. Provide parser code for `expr`, `term`, and `factor` and show how to parse and evaluate the expression into an `Int` result. Mention operator precedence handling.
EasyTechnical
0 practiced
Write a safe version of `head` in Haskell with signature `safeHead :: [a] -> Maybe a`. Use pattern matching and explain why partial functions (like `head`) are discouraged in production Haskell code. Show an example of how `safeHead` integrates with `do`-notation (in a `Maybe` context).
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