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.
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.
HardTechnical
0 practiced
Implement safe resource handling in Haskell using `bracket` (or `withFile`) to open a file, read contents, and ensure the file handle is always closed even if an exception occurs. Explain the difference between `throwIO` and `error`, and why some exceptions must be caught in `IO` rather than pure code.
MediumTechnical
0 practiced
Explain what a lens is and why it's useful for updating deeply nested immutable structures. Implement a minimal manual lens for a simple record type (no external library): create `get` and `set` functions for a nested field and show how to compose them.
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.
EasyTechnical
0 practiced
Describe Haskell's lazy evaluation model and how it differs from eager (strict) languages. Give a short Haskell example that exploits laziness (e.g., an infinite list) and explain a scenario where laziness can lead to unexpected memory usage.
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