Scala Programming Interview Questions and Answers

Scala Programming Interview Questions and Answers

Scala (scalable language) is a general-purpose programming language providing support for functional programming and a strong static type system. Designed to be concise, many of Scala’s design decisions aimed to address criticisms of Java. Scala is a pure object-oriented language in the sense that every value is an object. Types and behaviour of objects are described by classes and traits. Classes are extended by sub classing and a flexible mixing-based composition mechanism as a clean replacement for multiple inheritance. Scala is also a functional language in the sense that every function is a value. Scala provides a lightweight syntax for defining anonymous functions, it supports higher-order functions, it allows functions to be nested, and supports currying. Scala’s case classes and its built-in support for pattern matching model algebraic types used in many functional programming languages. Singleton objects provide a convenient way to group functions that aren’t members of a class.Furthermore, Scala’s notion of pattern matching naturally extends to the processing of XML data with the help of right-ignoring sequence patterns, by way of general extension via extractor objects. In this context, for comprehensions are useful for formulating queries. These features make Scala ideal for developing applications like web services.

Scala is created by Martin Odersky (the father of javac), influenced by Java, Ruby, Smalltalk, ML, Haskell, and Erlang and was first released in 2003. It’s being used in the busiest websites like Twitter, LinkedIn, Tumblr, Netflix, and etc. present version of Scala 2.12.6 / 27 April 2018 is now available.

What is Scala?

Who is the author of Scala Programming language?

What makes Scala scalable?

What is a ‘Scala set’?

What is a ‘Scala map’?

What are the major advantages of Scala Language?

What are the drawbacks of Scala Language?

What are the Scala variables?

What is recursion tail in scala?

What is ‘scala trait’ in scala?

When do you use Scala Traits?

What is Case Classes?

What is the use of tuples in Scala?

What is function currying in Scala?

What are implicit parameters in Scala?

What is a closure in Scala?

What is Monad in Scala?

What is Scala anonymous function?

What is an Expression?

What is a Statement?

What is the difference between var and value?

What is the difference between concurrency and parallelism?

What is the difference between a trait and an abstract class?

What’s the difference ‘Nil’, ‘Null’, ‘None’ and ’Nothing’ in Scala?

What are option, some and none in scala?

How can you format a string?

Why scala prefers immutability?

What are the four types of scala identifiers?

What are the different types of Scala literals?

What are High Order Functions in Scala?

What is a Closure in Scala?

What is ‘Unit’ and ‘()’ in Scala?

What is Akka, Play, and Sleek in Scala?

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