What is Scala LEARNOVITA

What is Scala Programming? A Complete Guide with Best Practices

Last updated on 28th Oct 2022, Artciles, Blog

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Smita Jhingran (Big Data Engineer )

Smita Jhingran provides in-depth presentations on various big data technologies. She specializes in Docker, Hadoop, Microservices, Python & Scala, MiNiFi, Cloudera, Commvault, and BI tools with 5+ years of experience.

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    • In this article you will get
    • 1.Introduction to Scala programming
    • 2.Tools employed in Scala Programming
    • 3.Characteristics to Scala Programming
    • 4.Types of scala
    • 5.Characteristics
    • 6.How its works?
    • 7.Scala activity
    • 8.Benefits of Scala Programming
    • 9.Conclusion

Introduction to Scala programming

Scala may be an artificial language that mixes object-oriented options with useful language options. This written material language was developed by Martin Odersky and free in 2003. It’s been accustomed to improving a variety of applications which will be at the same time in recent years. Scala may be a normal, high-level, multi-programming language. it’s a pure language of object-oriented designing that conjointly provides support for effective designing. there’s no construct of recent knowledge as everything may be a factor in Scala. it’s designed to precise acquainted programming patterns during a refined, concise, and secure approach. Scala programs will convert to bytecodes and may add JVM (Java Virtual Machine). Scala stands for ascendible Language. It conjointly offers Javascript operative times. Scala is heavily influenced by Java and different programming languages such as Lisp, Haskell, Pizza, etc.

Scala appearance:

Scala was designed by Martin Odersky, a faculty member of programming at the Polycole Polytechnique Fédérale First State Metropolis (EPFL) in Europe and a German scientist. He started planning Scala in 2001. Scala was initially free in 2004 on the Java platform as its initial version.

Scala Appearance

Tools employed in Scala Programming:

Scala IDE Eclipse:

Yes there’s a Scala extension of Eclipse.Scala IDE three.0 offers a large variety of developer tools and options, in addition to many vital bug fixes. Advanced written material tools embrace secret writing, clear and linguistic light, and a full new set of indicators. There’s a shiny Scala bug fixer to make your lives easier, in addition as a reliable Junit detector to check and eliminate inconsistent errors.M


This is one in all 2 things. Emacs and Atoms area unit each text editors UN agency area unit terribly corroboratory of Scala, however these days we tend to area unit specializing in the fundamental technology that creates this potential – ENSIME. ENSIME may be a free software system designed to bring options like Scala and Java IDE to your favorite text editor. ENSIME is by no means a text editor or IDE. To use it, you would like a build tool, an .ensime file, and a text editor. The build tool downloads the ennime-server and therefore the text editor presents it. Though this can be less concerning than most days, the advantages are glorious. ENSIME supports content completion in addition as linguistics light and ambiguous enlargement. Engineers will jump to ASCII text files or scripts simply. ENSIME displays targeted sorts, supports refactorings, and most significantly, crooked red lines seem in your code to spotlight errors and alerts. A lot of data regarding ENSIME may be found here. ENSIME may be a free software system that depends on donations and support from developers similar to you.M

IntelliJ plan:

IntelliJ plan has created these sorts of lists before as this competent and engineering science IDE of JVM provides trilingual support. Although this can technically be a Java IDE, IDE provides support for several different languages such as Scala, Groovy, Kotlin, JavaScript, matter and SQL. in addition to several options, IntelliJ plan provides Scala-specific support for ScalaTest testing. This permits engineers to perform unit tests simply. different options embrace intelligent finishing, language injection, site-focused editor, and lots of helpful building tools. A lot of data regarding the IntelliJ plan may be found here. Although the IntelliJ plan needs purchase and annual subscription, the general public version is open supply.M


NetBeans IDE permits developers to quickly and simply upgrade desktop, mobile and internet applications. Due to its several written material, analysis, and written material options, NetBeans IDE makes things easier for developers. The sole project management tool is value viewing. The NetBeans Scala plugin includes a full Scala editor, complete with syntax color and linguistics colors, draft navigator, code completion, and more. there’s conjointly a computer program, interactive console, and integration with Junit and ace. A lot of data regarding the NetBeans Scala plugin may be found here. NetBeans is free, is open supply, and moves to Apache.


In fact, this can be typically the largest criticism regarding Vim: developers have to be compelled to install multiple plugins to induce precisely the surroundings they require. That being the same, Vim contains a range of Scala plugins to make it work. Vim-scala may be a nice basic plugin that you simply have to be compelled to manage syntax. The favored code finishing plugin is deoplete.nvim, a robust asynchronous finishing frame with dark power. Fzf is an associate degree freelance Vim instruction program that handles things like Jump to File and Jump to Definition.

Characteristics to Scala Programming

Object Oriented: Scala may be a pure language centered on associate object wherever every worth is taken into account associate object. Behavior and object classes square measure outlined by categories and options. Most Heritage is supported by mixin-based composition and increasing categories by cacophonous into smaller sections.

Functional: Scala is a full of life programming language wherever every operation is valued. Scala supports Nested and better Order functions likewise as provisions to outline anonymous functions.

Firmly typewritten: Scala implements a sort of system that has barriers and abbreviations for safe and consistent use in alternative words Scala may be a strictly typed language. web sort includes totally different annotations, commonplace classes, high and bottom borders, expressly typewritten indicators, views and polymorphic strategies. The native sort logical thinking mechanism ensures that there’s no got to outline a system with redundant sort data. All of this alone builds a powerful foundation for the safe use of system summaries.

Works on JVM: Scala runs on Java Virtual Machine (JVM) and once the scala system is integrated, a computer memory unit code generated by JVM is generated. each Scala and Java share a standard platform thus java programs are regenerated to Scala.

Using Java Code: Scala will use all Java SDK categories, custom java categories or Java open supply.

Types of scala

Type of Scala Hierarchy:

Every kind of {data|of information} and information} in Scala square measure objects with utility in their data. All Scale models square measure out there as a district of a category list. All the classes we’ve got a bent to explain in Scala additionally are a district of this category by default.

Any biological group of all categories, to boot, is observed as premium. Defines specific international methods like equivalent, hashCode, and toString. each has two specific subclasses:

  • AnyVal
  • AnyRef


  • // Scala Program Scala kind hierarchy
  • // creating associate object
  • into Geeks
  • the most methodology
  • def main (args: Array [String])
  • )
  • list.foreach (element => print ln (element))
  • “>
  • }
  • Output
  • lies
  • 66677
  • 732
  • a
  • abs

AnyVal represents worthy categories. All worthy categories square measure made public in advance; square measure compatible with older sorts of Java. Their square measures nine sorts of predefined values and they’re going to do nothing: Double, Float, Long, Int, Short, Byte, Char, Unit, and man of science. Scala has every variety (e.g., Int and Double) and non-numerical forms (e.g., Series) that will be accustomed to describe values and variables. The dream variables can only be true or false. Char literals square measure written in single quotes.

AnyRef stands for reference classes. All non-value varieties square measure made public as reference varieties. User-defined classes define reference varieties automatically; i.e. regular (indirectly) taxon scala.AnyRef. scala.AnyRef within the java system is compatible with java.lang.Object.

Nothing and Null: Nothing is part of every price, to boot, observed because the bottom sort. kind None global organization price. We have a tendency to square measure, able to use Nothing to point inconsistencies, sort of a special drop, program exit, or endless loop.

Syntax with examples:

Let’s contemplate an easy howdy world set up and perceive the fundamental structure of the scala system. This can be simply the start and can get into the method of fixing and putting in thoroughly within the next article.

  • Object may be a keyword, HelloWorld is that the name of the article to be created.
  • The implementation of the Scala program starts within the main approach therefore the main methodology is outlined by passing the string list as associate argument.
  • Def may be a keyword that indicates however we have a tendency to outline its term “main”. We have a tendency to use print ln to print “Hello World”.
  • Scala programs square measure a HelloWorld sensitive one that’s totally different from helloWorld.
  • The first letter of the category Name should be a majuscule.
  • The computer filename should be precisely the same because the object name.
  • After typewriting the program higher than within the scala shell, we have a tendency to get the message “specified object HelloWorld”.
  • case>
  • thing
  • HelloWorld
  • def main (args: Array [String])
  • { | }
  • Now use the HelloWorld program as;
  • case>
  • HelloWorld.main (null)
  • Hello World!!

How its works?

Editing in Scala: Since Scala is incredibly just like other widely used syntactically used languages, it’s straightforward to code and learn in Scala. Apps is written with Scala on any of the foremost wide used text editors like pad ++, gedit, etc. or to any text editors.In this article, we’ll discuss the way to implement Scala programs in on-line day.

Example:An easy print program howdy Geeks! by victimization associate object-focused approach.

  • // Scala Print Program Howdy, Geeks!
  • // by victimization associate object-focused approach
  • // to make associate object
  • Object Geeks the most methodology
  • def main (args: Array [String])
  • {
  • // prints howdy, Geeks!
  • println (“Hello, Geeks!”)
  • }
  • }
  • Output:
  • Hello, Geeks!
  • Comments are single line or multiple lines.
  • One-line comment:
  • Syntax:
  • // One-line comment
  • Multi-line comments:
  • Syntax:
  • / * Comments have multiple lines
  • syntax * /

Why is it important?

Scala has several reasons to be fashionable among program organizers.

Easy to induce Started: Scala is a complicated sophisticated} language so it’s about alternative in style programming languages like Java, C, C +. Therefore it’s terribly simple to be told Scala for anyone. For Java programmers, Scala is extremely simple to be told.

Contains advanced options: Scala contains features for various languages such as C, C ++, Java, etc. that makes it terribly helpful, versatile and productive.

Turn off Java integration: The Scala ASCII text file is meant in such the simplest way that its compiler will interpret Java categories. Also, Its Organiser will use Frames, Java Libraries, and Tools etc. once integration, Scala programs will run on JVM.

Web Support & Desktop Development: In net applications it provides integrated support in JavaScript. The same as desktop applications, they are often integrated into JVM bytecode.

Used by huge Companies: Most of the illustrious corporations like Apple, Twitter, Walmart, Google etc. submit most of their codes to Scala from alternative languages. The explanation being that they are often terribly measurable and may be employed in background tasks.

Uses of Scala

Scala Activity

An operation could be a cluster of statements that perform an operation. you’ll split your code into completely different functions.

Scala has each function and ways and that we use the word technique and that we add rotation with very little distinction. The Scala technique is an element of a category with a reputation, signature, specific annotations, and a particular bytecode wherever the operation in Scala could be a complete variable that may be allotted a variable. In alternative words, a function, outlined as a neighborhood of one thing, is named a way.

A job description will seem anyplace within the supply file and Scala permits job descriptions to nest, that is, job descriptions among alternative job descriptions. The foremost necessary purpose to notice is that the name of the Scala operation could contain characters like +, ++, ~, &, -, -, \, /,:, etc.

Benefits of Scala Programming

  • Scala’s subtle options offer higher writing and higher performance.
  • Tuples, macros, and functions are a development in Scala.
  • It incorporates AN object-oriented program and practicality that creates it a robust language.
  • It is extremely ascendable and therefore provides higher backend performance support.
  • Reduce the danger of high thread-security related to Java.
  • Because of the OS, usually, the user finishes up with a number of lines of code and distractions that lead to high productivity and quality.
  • Because of the lazy calculations, Scala counts expressions only if they’re required within the system.
  • There aren’t any fastened and versatile modes in Scala. Uses singleton (class with one item in supply file).
  • It conjointly offers a way of Traits. Symbols are a collection of invisible and non-visible ways in which are often integrated into a Java affiliation.


Scala could be a versatile and powerful language for general purpose, engineered on the Java Runtime setting, and may be simply integrated into existing Java applications. Language offers a fashionable set of ways for coping with several Java language shortcomings, ANd is an exciting combination of sensible and centered paradigms.

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