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Haskell Programming Interview Questions and Answers

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Last update: 30 Mar 2020, 17 Questions
Haskell Interview Questions

Most Frequently Asked Haskell Programming Interview Questions

1. What is Haskell & Why it is used for?

Haskell is a statically typed and purely function programming language, especially used for its built-in concurrency, easy integration with other languages and highly feature including libraries. The language is evolved to best evaluating expressions rather than executing instructions.

2. What are the advantages & disadvantages of Haskell programming?
S.no Advantages Disadvantages
1. Advance type safety compared to most mainstream languages Complicated interface
2. Includes type inference cryptic programs, sometimes complex understand
3. Offers high performance executable not suitable to make time critical applications
4. Quick prototype idea build due to the interactive environment High learning time
5. Highly expressive and concise syntax Lacks widespread implementation
6. Actively developed and improved  
3. What is the latest version of Haskell?

The latest version of Haskell is version 8.6.3, released in 2010. A group of develop is currently working on the next advance standard named “Haskell2020”.

4. What are Monads in Haskell?

In Haskell, Monad is a process to structure computations in terms of sequences and values of computations using those values. This allows the programmers to build up computations using sequential building blocks.

7. What are the kinds of operators used in Haskell?
There are five types of operators available in Haskell:
  • Addition Operator–Used for additional function
  • Subtraction Operator–Used for the subtraction operation
  • Multiplication Operator –Used for the multiplication operation
  • Division Operator –Used to divide two set of numbers between Haskell
  • Range / Sequence Operator –Special operator in Haskell denoted by "(..)". Used to declare a list with a sequence value.

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8. What is lazy evaluation in Haskell?

It’s Haskell program evaluating method in which expressions are not evaluated when they are bound with variables, but the program evaluation is going to defer until their results are required by other computations.Simplifying it, this means call-by-name plus sharing, which is opposite to eager evaluation.

9. What is currying in Haskell?

In Haskell, currying is a fact where a function takes n arguments and returns it with a function with n-1 arguments. The fact works when only one argument is applied.

10. What is Zippers in Haskell?

Haskell Zippers are akin to cursors and allow users to traverse trees in an ordered manner. The usual operations of Zippers are up, down, right, left and edit. They are variant of a datatype and unfolds the type into its local context and its all direction extents.

11. Explain the types of Modules used in Haskell
Total of five types of modules available for Haskell. Here is a short and brief list of them:
  • List Module–It provides functions associated with list type data.
  • Char Module –Offers predefined functions to work with the character type
  • Map Module –It’s an unsorted value-added pair type data type.
  • Set Module–Basically used to manipulate mathematical data
  • Custom Module –These modules can be called at other programs.

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12. Explain the difference between Haskell and Erlang?
S.no Haskell Erlang
1. Statically typed functional programming Dynamically typed functional programming
2. The nature of programming is a traditional sand general purpose. The nature of programming is based on the run-time actor system model.
3. Ability to abstract semantics and invariants. Average outside it niche
4. Performs mediocre, rediscover from the scratch Excellent support for the distributed system
5. Categorized as mathematical and academic oriented Categorized as pragmatic and practical
13. What is Prelude in Haskell

Prelude is a standard module present in Haskell and is imported by default into every Haskell module unless there is an explicit import statement present in the module or module’s NoImplicitPrelude extension is enabled.

15. What is the purpose of a functor Haskell?

In Haskell, functions a functional representation of different types which can be mapped over. It’s a high-level concept of implementing polymorphism — the instances of Haskell functorincludes List, Tree, Map, etc.

17. Difference between `data` and `newtype` in Haskell?
S.no Data new type
1. It declares an entirely new data structure at runtime. It guarantees that data will have the exact same representation at runtime, as the type programmers wrap.
2. It introduces lazy value constructor It introduces strict value constructor