Haskell Interview Questions and Answers

We have listed of Haskell Interview Questions that have been designed for Haskell professionals who are preparing interviews on Haskell. Haskell is a deep language; we think learning it is a hugely rewarding experience. Haskell is most likely quite different from any language you’ve ever used before. Compared to the usual set of concepts in a programmer’s mental toolbox, functional programming offers us a profoundly different way to think about software.

Best Haskell Interview Questions and Answers

Below we have provided best Haskell Interview Questions that are specially designed for Haskell Programmers.

Haskell is a language with many implementations, two of which are widely used. Hugs is an interpreter that is primarily used for teaching. For real applications, the Glasgow Haskell Compiler (GHC) is much more popular.

What is Haskell?

Haskell is an advanced purely functional programming language. The product of more than twenty years of cutting edge research, it allows rapid development of robust, concise, correct software. With strong support for integration with other languages, built-in concurrency and parallelism, debuggers, profilers, rich libraries and an active community, Haskell makes it easier to produce flexible, maintainable high-quality software.

What are the features of Haskell?

Haskell distinguishes function calls from infix operators syntactically, but not semantically. Function names which are composed of punctuation characters can be used as operators, as can other function names if surrounded with backticks; and operators can be used in prefix notation if surrounded with parentheses. 

What to expect from Haskell?

Haskell is a general purpose programming language. It was designed without any application niche in mind. Although it takes a strong stand on how programs should be written, it does not favor one problem domain over others. 

Explain comparison of traditional static languages with Haskell?

Languages that use simple static type systems have been the mainstay of the programming world for decades. Haskell is statically typed, but its notion of what types are for, and what we can do with them, is much more flexible and powerful than traditional languages. Types make a major contribution to the brevity, clarity, and efficiency of Haskell programs.

Although powerful, Haskell’s type system is often also unobtrusive. If we omit explicit type information, a Haskell compiler will automatically infer the type of an expression or function. Compared to traditional static languages, to which we must spoon-feed large amounts of type information, the combination of power and inference in Haskell’s type system significantly reduces the clutter and redundancy of our code. 

Compare Haskell to modern dynamic languages?

Over the past decade, dynamically typed, interpreted languages have become increasingly popular. They offer substantial benefits in developer productivity. Although this often comes at the cost of a huge performance hit, for many programming tasks productivity trumps performance, or performance isn’t a significant factor in any case.

Brevity is one area in which Haskell and dynamically typed languages perform similarly: in each case, we write much less code to solve a problem than in a traditional language. Programs are often around the same size in dynamically typed languages and Haskell.

For practical work, almost as important as a language itself is the ecosystem of libraries and tools around it. Haskell has a strong showing in this area.

What is Profiling Haskell Programs

Let’s consider the following list manipulating program, which naively computes the mean of some large list of values. While only a program fragment (and we’ll stress that the particular algorithm we’re implementing is irrelevant here), it is representative of real code that we might find in any Haskell program: typically, concise list manipulation code and heavy use of standard library functions.

Defining Concurrency and Parallelism

A concurrent program needs to perform several possibly unrelated tasks at the same time. Consider the example of a game server: it is typically composed of dozens of components, each of which has complicated interactions with the outside world.

parallel program solves a single problem. Consider a financial model that attempts to predict the next minute of fluctuations in the price of a single stock. If we want to apply this model to every stock listed on an exchange.

What is HDBC?

Haskell has several different database frameworks available, some providing high-level layers atop others. For this chapter, we will concentrate on the Haskell DataBase Connectivity system (HDBC). HDBC is a database abstraction library. That is, you can write code that uses HDBC and can access data stored in almost any SQL database with little or no modification.

Thus, the compilation of these questions includes some of the major points that can be asked during an interview. The Haskell interviewers generally check the base knowledge of a candidate, which can be gained by practicing these questions prior interview.

So if you have finally found your dream job in Haskell but are wondering how to crack the Haskell Interview and what could be the probable Haskell Interview Questions. Every interview is different and the scope of a job is different too. Hope above assist you to get a dream Job. Keep Learn.