10 Things About Scala Interview Question Experience it
What is Scala?
Scala Interview Questions: Scala is an abbreviation for Scalable language that is a general purpose hybrid functional programming language. The language is designed to run on the java virtual machine implying that you can use all the classes that come with the java SDK.
While appearing for your interview, present yourself gracefully and take time to figure out and plan the answers before you speak. In case you have any doubts about a question, ask the interviewer instead of beating around the bush.
Be confident and approach the day with an optimistic outlook. You are sure to crack the interview.
??All the best!
|Stable release:||2.13.1 /?18 September 2019; 5 months ago|
|Typing discipline😕||Inferred, static,?strong, structural|
|Designed by😕||Martin Odersky|
|First appeared😕||20 January 2004; 16 years ago|
|Developer:||Programming Methods Laboratory of??cole polytechnique f?d?rale de Lausanne|
What are the benefits of Scala over other programming languages?
- It is cross compatible with java
- It runs on the Java Virtual Machine
- Programmers can use it to produce cleaner, elegant, and concise code.
Explain a few differences between java and scala?
- In scala, values are immutable while in java, they are mutable
- Scala uses a control statement called pattern matching while java uses switch statements.
Scala Interview Questions, What is a scala map?
It is a collection of elements in pairs of keys and values where the values can be retrieved using keys. The included values must not be unique although the keys have to. Scala supports both immutable and mutable scaling.
Why is scala faster than java?
Scala supports an optimization technique called tail call recursion that helps its code to compile faster than java.
What is type interface in Scala?
A unique interface in Scala that helps reduce the amount of code that is written by programmers while coding using this language.
What is the difference between a function and a method in scala?
Functions are defined in a package while methods are defined in a class. Additionally, functions can be accessed without objects while methods cannot be used without an object.
What is the meaning of REPL in Scala?
REPL stands for Read-Evaluate-Print Loop. It is an interpreter that helps programmers execute code from the command prompt.
What is a bitset in Scala?
It is a collection of non-negative integers that are depicted as arrays in Scala. In a bitset, the most significant number determines the memory footprint.
What are the main drawbacks of using the scala language?
- It is difficult to learn
- There are not many programmers who use the language implying that there is little online support for it.
What do you understand by a case class in Scala?
Case classes are standard classes declared with a special modifier case. Case classes export their constructor parameters and provide a recursive decomposition mechanism through pattern matching. The constructor parameters of case classes are treated as public values and can be accessed directly. For a case class, companion objects and its associated method also get generated automatically. All the methods in the class, as well, methods in the companion objects are generated based on the parameter list. The only advantage of Case class is that it automatically generates the methods from the parameter list.
Features of Case Class in Scala
- Case objects and Case class are serializable by default.
- Case classes can be used for pattern matching.
What is the val and var in scala?
Var is standing for variable and Val is standing for value. Var is used to define Mutable variable and value can be reassigned after the creation of it. Val is used to defining Immutable variables which means the value cannot be reassigned once it?s created.
What is a lens in Scala?
A lens is an abstraction from functional programming. It makes updating complex immutable nested objects easier for us.
For lenses, we have three kinds of available implementations:
- Quicklens- Has more functionality than a Sauron