{"id":19885,"date":"2018-06-28T04:20:12","date_gmt":"2018-06-28T04:20:12","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=19885"},"modified":"2021-12-04T10:15:12","modified_gmt":"2021-12-04T04:45:12","slug":"scala-interview-questions-and-answers","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/scala-interview-questions-and-answers\/","title":{"rendered":"Best Scala Interview Questions and Answers &#8211; Prepare Yourself"},"content":{"rendered":"<p>In our last article, we discussed <a href=\"https:\/\/data-flair.training\/blogs\/scala-interview-questions\/\"><strong>Scala Interview questions and answers part 1<\/strong><\/a>. Today, we will discuss the Top Scala Interview Questions and Answers. These Scala Interview Questions and Answers are designed by Scala experts for both Scala freshers and experienced. Follow all the links to learn more about Scala.<\/p>\n<p>Let&#8217;s start exploring mostly asked Scala Interview Questions and Answers.<\/p>\n<h3>Top Scala Interview Questions and Answers<\/h3>\n<p>Below, we are discussing some frequently asked Scala Interview Questions and Answers:<\/p>\n<p><strong>Q.1. What is type inference in Scala?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">The Scala compiler decides data types or result types of elements like variables, expressions, and objects at compile-time. <\/span><br \/>\n<span style=\"font-weight: 400\">Scala infers the type for an expression fully or partially. This makes it work even when we don\u2019t declare it explicitly. It also allows for type checking without type annotations. The compiler considers types of atomic values or subexpressions and aggregates it to decide a type for the whole expression.<\/span><\/p>\n<p><strong><a href=\"https:\/\/goo.gl\/lZJOWF\">For more on this, read up on Features of Scala.<\/a><\/strong><\/p>\n<p><strong>Q.2. Is Int in Scala the same as java.lang.Integer in Java?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">While the two are similar in some ways, they also differ in other ways:<\/span><\/p>\n<p><strong>Differences:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Int does not implement the Comparable interface; java.lang.Integer does.<\/span><\/li>\n<\/ul>\n<p><strong>Similarities:<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">They\u2019re both classes<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">They are 32-bit signed integers<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">They represent integer numbers<\/span><\/li>\n<\/ul>\n<p><strong>Q.3. What is an anonymous function?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">An anonymous <strong><a href=\"https:\/\/data-flair.training\/blogs\/partial-functions-scala-guide\/\">function in Scala<\/a><\/strong> is a function literal. At runtime, Scala instantiates into a function value. Since this is a way to create a function using just one line of code, we can call it lightweight. Here\u2019s an example:<\/span><\/p>\n<pre class=\"EnlighterJSRAW\">scala&gt; val mul=(a:Int,b:Int)=&gt;a*b\r\nmul: (Int, Int) =&gt; Int = $$Lambda$1541\/400146874@3aca06a3\r\nscala&gt; mul(3,4)<\/pre>\n<p><span style=\"font-weight: 400\">res50: Int = 12<\/span><\/p>\n<p><strong>Q.4. Explain implicit parameters.<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Much like default parameters, implicit parameters help us find default values. To make a parameter implicit, we can pass it to a method or a constructor and label it as <\/span><i><span style=\"font-weight: 400\">implicit<\/span><\/i><span style=\"font-weight: 400\">. So when we don\u2019t mention the value of a parameter, the compiler searches for an implicit value defined within a scope.<\/span><\/p>\n<p><span style=\"font-weight: 400\">In Part I, we discussed the precedence for implicit parameters.<\/span><\/p>\n<p><strong>Q.5. What is a case class?<\/strong><\/p>\n<p><span style=\"font-weight: 400\"><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-case-class\/\">Scala Case classes<\/a><\/strong> let us model immutable data. For object construction, these classes have an apply() method to handle object construction. These classes have all <\/span><i><span style=\"font-weight: 400\">val<\/span><\/i><span style=\"font-weight: 400\">s, and so prove useful with pattern-matching. Let\u2019s take an example.<\/span><\/p>\n<pre class=\"EnlighterJSRAW\">scala&gt; case class Book(title:String, author:String, ISBN: String)\r\ndefined class Book<\/pre>\n<p><strong>Q.6. What can you tell me about the Scala REPL?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">While we often call it ripple, REPL expands to Read Evaluate Print Loop. We can access it from the command prompt by typing \u2018scala\u2019:<\/span><\/p>\n<pre class=\"EnlighterJSRAW\">C:\\Users\\lifei&gt;scala<\/pre>\n<p><span style=\"font-weight: 400\">Welcome to Scala 2.12.5 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_161).<\/span><\/p>\n<p><span style=\"font-weight: 400\">Type in expressions for evaluation. Or try :help.<\/span><br \/>\n<span style=\"font-weight: 400\">scala&gt;<\/span><\/p>\n<p><span style=\"font-weight: 400\">This is the Command Line Interface(CLI) and command-line shell for Scala, and we can execute Scala code in it as if in an interpreter. We can build and <\/span><span style=\"font-weight: 400\">test small pieces of code in it.<\/span><\/p>\n<p><strong>Q.7. What is a Map in Scala?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">A map is a collection in Scala that holds key-value pairs. A map can only hold unique keys, but values can be repeated. We also call these hash tables. <\/span><\/p>\n<p><span style=\"font-weight: 400\">By default, maps are immutable, but we can use the scala.collection.mutable.Map class for a mutable map. This is an example:<\/span><\/p>\n<pre class=\"EnlighterJSRAW\">scala&gt; var m=Map(\"red\"-&gt;0,\"green\"-&gt;1,\"blue\"-&gt;2)\r\nm: scala.collection.immutable.Map[String,Int] = Map(red -&gt; 0, green -&gt; 1, blue -&gt; 2)<\/pre>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-map\/\">For more on maps, read up on Maps in Scala.<\/a><\/strong><\/p>\n<p><strong>Q.8. Differentiate between arrays and lists in Scala.<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\">scala&gt; var m=Map(\"red\"-&gt;0,\"green\"-&gt;1,\"blue\"-&gt;2)<\/pre>\n<p>We have the following differences:<\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\"><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-array\/\">Arrays<\/a><\/strong> are mutable; lists are immutable<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Arrays are invariants; lists are covariants<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">In size, arrays are fixed, but lists are variable<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">We can modify array values later, but that is not the same with lists<\/span><\/li>\n<\/ul>\n<p><strong>Q.9. Is Scala a pure object-oriented language?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Let\u2019s see the <strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-object-oriented-programming\/\">object-oriented language.<\/a><\/strong><\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">There are no static members<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Scala treats functions and primitives as objects<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">So, we can conclude that Scala is indeed purely object-oriented as a language.<\/span><\/p>\n<p><strong>Q.10. What is a lazy val?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Scala executes a val when we define it, but executes a lazy val only when we access it the first time. We declare it using the keyword <\/span><i><span style=\"font-weight: 400\">lazy<\/span><\/i><span style=\"font-weight: 400\">:<\/span><\/p>\n<pre class=\"EnlighterJSRAW\">scala&gt; lazy val x=7\r\nx: Int = &lt;lazy&gt;\r\nscala&gt; lazy val x=2+3\r\nx: Int = &lt;lazy&gt;<\/pre>\n<p><span style=\"font-weight: 400\">Where eager evaluation is at compile-time, lazy evaluation is at run-time.\\<\/span><\/p>\n<p><strong>Scala Interview Questions and Answers for freshers- Q. 1,3,4,5,7,8,9,10<\/strong><\/p>\n<p><strong>Scala Interview Questions and Answers for experienced- Q. 2,6<\/strong><\/p>\n<p><strong>Q.11. How many reserved keywords of Scala can you recall?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Scala has 39 keywords-<\/span><\/p>\n<p><span style=\"font-weight: 400\">abstract, case, catch, class, def, do, else, extends, false, final, finally, for, forSome, if, implicit, import, lazy, match, new, null, object, override, package, private, protected, return, sealed, super, this, throw, trait, try, true, type, val, var, while, with and, yield.<\/span><\/p>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-throw-keyword\/\">Let&#8217;s learn Scala Throw Keyword<\/a><\/strong><\/p>\n<p><strong>Q.12. Is it possible to use a Scala keyword as an identifier?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">While it might instinctively seem otherwise, you can use a reserved keyword as an identifier in Scala. Use backticks for this. As an example, we can use backticks on the word <\/span><i><span style=\"font-weight: 400\">yield<\/span><\/i><span style=\"font-weight: 400\"> to use Java\u2019s <\/span><i><span style=\"font-weight: 400\">yield<\/span><\/i><span style=\"font-weight: 400\"> method from Thread class instead of Scala\u2019s yield.<\/span><br \/>\n<span style=\"font-weight: 400\">Thread.`yield`()<\/span><\/p>\n<p><strong>Q.13. Is an expression the same as a statement in a Scala?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">A statement is one or more operation, but an expression is a value. This means we can assign an expression to a variable, but we can\u2019t assign a statement to the same. Examples of expressions- Scala\u2019s if-condition, Java\u2019s ternary operator. Examples of statements- Java\u2019s if-condition.<\/span><\/p>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-regex\/\">Let&#8217;s revise Scala Regular expression<\/a><\/strong><\/p>\n<p><strong>Q.14. Differentiate between equals() and == in Scala. Is the latter the same as == in Java?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">When we try to compare two instances with the == operator, Scala calls the object\u2019s equals() method. We use it to check instance equality. However, in Java, we use it to check reference equality. This tells us whether two references point to the same object.<\/span><\/p>\n<p><strong>Q.15. Explain the differences between the if-else statements for Scala and Java.<\/strong><\/p>\n<p><span style=\"font-weight: 400\">There is one main difference. This statement is an expression in Scala, but not in Java. There, we cannot assign it to a variable because it doesn\u2019t return a value.<\/span><\/p>\n<pre class=\"EnlighterJSRAW\">Scala:\r\nscala&gt; val x=3\r\nx: Int = 3\r\nscala&gt; val kind= if(x%2==0) \"even\" else \"odd\"\r\nkind: String = odd\r\nJava:\r\nint x=3;\r\nString kind;\r\nif(x%2==0)\r\nkind=\u201deven\u201d;\r\nelse\r\nkind=\u201dodd\u201d;<\/pre>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-else-statements-statements\/\">Learn more about Scala If-else Statements<\/a><\/strong><\/p>\n<p><strong>Q.16. How are Scala\u2019s inner classes different from those of Java?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">In Scala, an inner class is associated with the outer class\u2019 object. In Java, however, an inner class is associated with the outer class; the inner class is a member of the outer class.<\/span><\/p>\n<p><strong>Q.17. Is Scala expression-based or statement-based? What about Java?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Yes, Scala is expression-based. You already know everything is a value in Scala. This means all expressions and statements evaluate to a value. So, we can assign expressions, functions, closures, objects, and other entities to variables. But things aren\u2019t the same with Java. Hence, Java is statement-based.<\/span><\/p>\n<p><strong>Q.18. Why doesn\u2019t Scala have the keyword \u2018static\u2019?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">The team made this decision to maintain the nature of Scala as a pure object-oriented language. If they included it, we could access class members without having to create an object. That would violate the principles of OOP. Note that this means Java isn\u2019t a purely object-oriented language.<\/span><\/p>\n<p><strong>Q.19. Between Scala and Java, what are some features only one of them supports?<\/strong><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Operator overloading- Scala<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Static members- Java<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Primitive data types- Java<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Implicits and traits- Scala<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Explicit type casting- Java<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">break and continue statements- Java<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Checked and unchecked exceptions- Java<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Pattern matching- Scala<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">++ and &#8212; operators- Java<\/span><\/li>\n<\/ul>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/features-of-java\/\">Let&#8217;s revise Features of Java<\/a><\/strong><\/p>\n<p><strong>Q.20. Can companion objects access private members of their companion classes?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Yes. A companion object can access its companion class\u2019 private members, but the vice-versa is true as well.<\/span><\/p>\n<p><strong>Scala Interview Questions and Answers for freshers- Q. 11,12,13,16,18,19,20<\/strong><\/p>\n<p><strong>Scala Interview Questions and Answers for experienced- Q. 14,15,17<\/strong><\/p>\n<p><strong>Q.21. How do you implement interfaces in Scala?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">This is a trick question to throw you off. Scala has no interfaces. Here, we have traits instead. Refer to <a href=\"https:\/\/data-flair.training\/blogs\/scala-trait\/\"><strong>Traits<\/strong><\/a> and <a href=\"https:\/\/data-flair.training\/blogs\/scala-trait-mixins\/\"><strong>Trait Mixins in Scala<\/strong><\/a>.<\/span><\/p>\n<p><strong>Q.22. Functions and methods are the same in Scala. Is that true?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">No. While we use the same syntax to define both, there is a difference:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Methods associated with an object. So we can call it on an instance of a class, but cannot call it directly without an object. We can define it in a class or in a trait.<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">A function, however, doesn\u2019t associate with a class or with a trait. We can access it without an object, and we define it in a Scala package.<\/span><\/li>\n<\/ul>\n<p><strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-string-method\/\">Let&#8217;s learn Scala String Method<\/a><\/strong><\/p>\n<p><strong>Q.23. What are some popular MVC frameworks for developing web applications with Scala?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Here are a few names:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Play<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Spray<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Lift<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Scalatra<\/span><\/li>\n<\/ul>\n<p><strong>Q.24. How many public class files can you define in a Scala source file? Not more than one?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">While that would be the case with Java, Scala actually lets us have as many as we want.<\/span><\/p>\n<p><strong>Q.25. What are some default imports in Scala?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Some names:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">java.lang package<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">scala package<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">scala.PreDef<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">In Java, the JVM automatically imports java.lang as the default package into each program so we don\u2019t have to do it manually.<\/span><\/p>\n<p><strong>Q.26. Between Java and Scala, what are some OOP concepts that only one of the languages supports?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Scala has the following OOP constructs that Java lacks:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Traits<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">It solves the inheritance diamond problem<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">And Java has these:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Interfaces<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Enum<\/span><\/li>\n<\/ul>\n<p><strong>Q.27. How many operators does Scala have?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Only one- The \u2018=\u2019 operator. No, we\u2019re not forgetting +, -, and other such ones. Those are methods, not <strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-operator\/\">Scala operators<\/a><\/strong>. You can attribute this to operator overloading.<\/span><\/p>\n<p><span style=\"font-weight: 400\">Let\u2019s take an example. For the expression 5+6, + is a method in the Int class. The compiler knows that these are integers, and looks for the + method in Int. It makes a call on the object 5 as: 5.+(6), and returns 11. This is some syntactic sugar.<\/span><\/p>\n<p><strong>Q.28. Name some IDEs that support Play and Scala-based Application Development.<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Two popular <strong><a href=\"https:\/\/data-flair.training\/blogs\/scala-environment-setup\/\">IDEs<\/a><\/strong> that help us with our purpose are:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">IntelliJ IDEA<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Eclipse IDE<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">These IDEs have plugins for Scala. To find out how to download and install IntelliJ, read up on Scala Environment Setup.<\/span><\/p>\n<p><strong>Q.29. Have you heard of SBT?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">Yes. SBT expands to Scala Build Tool. Using this simple build tool, we can easily develop Scala-based applications. We can also use it to develop for Play and Scala applications. IntelliJ uses SBT as a build tool for its Scala plugin.<\/span><\/p>\n<p><strong>Q.30. Okay, so what are some other tools available for this purpose?<\/strong><\/p>\n<p><span style=\"font-weight: 400\">While SBT is very popular, other common tools are Maven and Gradle.<\/span><\/p>\n<p><strong>Scala Interview Questions and Answers for freshers- Q. 21,22,23,24,25,27,29,30<\/strong><\/p>\n<p><strong>Scala Interview Questions and Answers for experienced- Q. 26,28<\/strong><\/p>\n<p>So, this was all in Scala Interview Questions and Answers.<\/p>\n<h3>Conclusion<\/h3>\n<p><span style=\"font-weight: 400\">Hence, you have completed Scala Interview Questions and Answers. Hope this questions will help you to crack your Scala Interview. In this part, we have tried to focus on some new concepts in Scala. If you have any doubt regarding Scala interview questions and answers, drop your feedback in the comments.<\/span><br \/>\n<strong><a href=\"https:\/\/www.scala-lang.org\/\">For reference<\/a><\/strong><span hidden class=\"__iawmlf-post-loop-links\" data-iawmlf-links=\"[{&quot;id&quot;:1909,&quot;href&quot;:&quot;https:\\\/\\\/goo.gl\\\/lZJOWF&quot;,&quot;archived_href&quot;:&quot;http:\\\/\\\/web-wp.archive.org\\\/web\\\/20250228073307\\\/https:\\\/\\\/goo.gl\\\/LzJoWF&quot;,&quot;redirect_href&quot;:&quot;&quot;,&quot;checks&quot;:[{&quot;date&quot;:&quot;2025-12-10 08:02:36&quot;,&quot;http_code&quot;:503},{&quot;date&quot;:&quot;2025-12-15 13:19:16&quot;,&quot;http_code&quot;:403},{&quot;date&quot;:&quot;2025-12-23 02:56:05&quot;,&quot;http_code&quot;:503},{&quot;date&quot;:&quot;2026-01-23 01:40:43&quot;,&quot;http_code&quot;:503},{&quot;date&quot;:&quot;2026-02-06 07:58:27&quot;,&quot;http_code&quot;:403},{&quot;date&quot;:&quot;2026-02-25 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