Haskell Programming Interview Questions

Haskell Interview Questions

An Overview of Haskell

Haskell is purely functional and statically typed programming language. Named after Haskell Curry, an American mathematician and first introduced in 1990, the final balance of flexible and inflexible qualities makes Haskell a demanding programming language to learn and used by businesses globally. The Haskell program itself is a series of high-level generalizable functions which define the intended tasks for the applications, letting lower slayers handle mundane low-level details.

Here functions are treated as values such as strings and integers. Also, users here can add one function to another same they can add an integer to an integer. If you are going to have an interview with Haskell programming, continue further to know best Haskell interview questions and best-suggested answers for them here.


  • It offers lazy evaluation, resulting in better performance, and permits data structures to be defined that have no size limit.
  • Provides pure functions, guaranteeing always to return and give the same input.
  • Simplified debugging and easy prediction of real-world behavior.
  • Strong and static typing, resulting in performance benefits of compiled code.

Let’s discuss the most interviewers asked Haskell programming interview questions and expert suggested answers for them further for your swift acknowledgment.

Best Haskell Programming Interview Questions And Answers

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.

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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  
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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”.

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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.

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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.

Best Haskell interview questions to practice

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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.

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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.

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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.

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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.

Expertly selected Haskell programming interview questions for experienced

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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
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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.

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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.

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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
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