One of the questions my readers often ask me is, Why should Java developers learn Scala,” and so on? “Should Java developers learn Scala ? Does Scala have a better future than Java ? Well, there can be many reasons for learning Scala, like you are forced to learn it because it has been used in the new company you have just joined, or your solution architect decided to use it for the new project you are going to work, but that’s a different story. Here, we’ll talk about the that encourages Java developers to learn Scala. reasons Scala has emerged as one the most powerful Java alternatives in recent times. It’s been the of choice, leaving and way behind, and is preferred as the language people want to write the most code in. JVM language Groovy Kotlin Scala has many strong points, the strongest being that it’s a . multi-paradigm language Along with the superiority of functional programming idioms available to take advantage of multi-core CPU architectures, Scala has the right mix of popular paradigm. object-oriented It not only solves many of Java’s issues, e.g. less to no boilerplate, but it also provides several best practices and patterns right in the language, e.g. immutability with the keyword and case classes. val Despite providing the fluency and flexibility of dynamic languages like , it’s still a strongly statically typed language to prevent you from doing bad things, which just happen at runtime in dynamic languages. Python I am sure Scala developers will add many more reasons into this list, but being from a Java background and ardent supporter of Java, I think Scala definitely has something to offer, and the following reasons make a lot of sense for to learn Scala. Java developers Without any further ado, here is my list of 10 reasons why a programmer should learn Scala: 1. Multi-Paradigm Language Scala is a bit different than Java, as it supports two programming paradigms: object-oriented programming ( ) and functional programming ( ). OOP FP To advance your programming skills, it’s good to learn at least one language from different paradigms, e.g. imperative, logical, functional, and OOP, and Scala gives you a chance to explore both functional and OOP together. The book also advises you to learn a new programming language every year. Pragmatic Programmer The Pragmatic book for Programmers Scala allows you to define types associated with both data attributes (with classes behaving like / classes) and behavior attributes (with traits corresponding to Java interfaces). C++ Java Just like in other functional programming languages, In Scala, (which means you can pass them around as values) and Scala also supports anonymous functions and currying (partial application of multi-argument functions). functions are first-class citizens This combination of features makes it possible to write Scala programs that are quite concise and elegant. Being multi-paradigm is one of the strongest selling points of Scala, which Java 8 has also attempted by introducing lambda expressions (see ), but it is still a couple of steps behind. I think, Scala will always be more functional than Java, but that’s topic of another debate. Java SE 8 New Features 2. Interoperability With Java In my opinion, Scala’s choice of being inter-operable with Java is the best thing happen to Scala. runs on the Java Virtual Machine ( ) and can interoperate nicely with Java code. Scala JVM This also means Scala developers can use Java libraries directly from Scala code. Given, many Java developers are turning to Scala, this is the perfect way of leveraging their years of experience in real-world Java programming. It is also possible to call Scala code from Java, and you can easily write part of your program in Scala and the rest in Java. In short, interoperability with gives Scala huge potential to become mainstream, enterprise programming language, as so much of the world’s code is written in Java and so many developers are working in Java around the world. Java 3. Best Practices and Patterns Built-In Language One thing you might not know about Scala is that it was originally developed at the Swiss university EPFL in an attempt to apply recent innovations in programming language research to a language that can gain mainstream traction, much like Java. Several best practices and patterns are built into the language itself, e.g. val declares top-level , which is much better than the overloaded keyword in Java, or const/read-only in C# with the weird rules associated with it. immutability final It also got , which makes it easy to create immutable Classes in Scala. case classes Scala also offers closures, a feature that dynamic languages like and have adopted from the functional programming paradigm. Python Ruby 4. Expressiveness When you compare Scala with Java as I did in my previous post about the , Scala certainly scores big over Java. differences between Scala and Java Scala is inherently very expressive. There’s also tons and tons of really beautiful and useful code written in Scala. This is attracting more and more Java developers to learn Scala, who like to write beautiful and . clean code To give you an idea, here is the written in both Java and Scala, you can see the difference in the expressiveness of language by yourself. word count program Scala has achieved in just one line what Java has taken more than 10 lines to achieve. Scala code is more clear and concise By the way, things can be improved on the Java side by using like and , which is not used in this example, but still, Scala scores big over Java when it comes to concise and clean code. Java 8 features lambdas stream 5. Marketable What programmer doesn’t want to be marketable? One reason for learning a or framework is always a better job and career growth. new technology Learning Scala will certainly make you more marketable. Many companies are using or migrating to Scala these days, including Twitter, LinkedIn, Foursquare, and Quora. Given Scala’s marketing as Scalable language, the days are not far when the big investment banks and financial organizations will start looking Scala for their low-latency solutions. Similar to the advice given in Twitter has already shared best practices to develop programs in Scala as Effective Scala. Effective Java , The founders of Quora spent a couple of months building a in order to use Scala. Scala web framework , the man behind Scala, is now behind the start-up , formally known as Typesafe for supporting commercial Scala development. Martin Odersky Lightbend Everything is going in the right direction for Scala to grow as the prime alternative to Java. 6. Statically Typed In general, a statically typed language like Java prevents programmers from doing bad things, while, with a dynamic language like , you only know about a bad thing when you run the program. Python Scala has the best of both worlds. It feels dynamic, but it’s strongly statically typed. The Scala compiler is really smart and uses type-inference to its fullest extent. Scala provides type inference for variables and functions, much better than the limited type inference in and . Java C# 7. Growing Frameworks One thing you might know about the ecosystem is that Scala is growing. There are lots of good libraries and frameworks coming around. Companies that have started using Scala are also contributing to the recent growth of Scala as a mainstream language. There are some nice Scala web frameworks out there, including Lift and Play. Akka, another Scala-based concurrent framework has already established itself as toolkit and runtime for building highly concurrent, distributed, and fault-tolerant event-driven applications on the JVM. Scala is also been used in along with , which has further fuelled its adoption by many Java developers interested in Big Data. Big Data space Apache Spark Btw, If you are interested in Spark, then you can also take a look at the course on Udemy. Learn Apache Spark from Scratch 8. Growing Community Along with the language and associated frameworks, the Scala community is also growing. Lots of programmers, including , are joining the Scala bandwagon. Java developers More and more IDEs have started to support Scala syntax, and there’s much better support in and . There’s also great build tool support in SBT, Maven, and Ant. Eclipse IntelliJ In recent surveys, Scala has also been touted as the number one alternative to Java. In my opinion, to grow Scala as the real alternative of Java, given also has support, it has to attract more and more Java developers. Java 8 functional programming Getting big organizations like Twitter to adopt Scala certainly helps the community, as they have more resources and influence. 9. Concise Syntax Java has long been criticized for his verbose and boilerplate-heavy syntax. Though it makes Java more readable, much like English, Scala has set a new benchmark in being concise and readable at the same time. The Scala compiler, known as scalac (remember ) does more than you expect. It can generate , , and other things for you. Consider two code snippets of the same class written in Java and Scala to help you make your choice: javac toString() equals() hasCode() public class Book {
private final String name;
private final double price;

public Star(String name, double price) {
this.name = name;
this.price = price;
}

@Override
public int hashCode() {
int hash = 7;
hash = 23 * hash + Objects.hashCode(this.name);
return hash;
}

@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}

if (getClass() != obj.getClass()) {
return false;
}

final Test other = (Test) obj;

if (!Objects.equals(this.name, other.name)) {
   return false;
}

if (Double.doubleToLongBits(this.price) != Double.doubleToLongBits(other.price)) {
  return false;
}
return true;
}

@Override
public String toString() {
 return "Test{" + "name=" + name + ", price=" + price + '}';
}

} You can write the same thing, using Scala’s case class: case class Book(name: String, price: double) By the way, you can also use the Lombok library, one of the , to remove the boilerplate code related to getters, setters, equals, hashCode, and toString. It can automatically generate those for you. essential libraries for Java developers 10. Easier to Learn compared to Haskell, other Functional Programming languages For a Java developer, learning a classical functional programming language like Haskell or OCaml is rather more difficult than Scala. In other words, Scala is relatively easy to learn because of its OOP functionality. While taking their time to learn functional programming, Java developers can still be productive in Scala by leveraging their existing knowledge of . Like , Scala has clean syntax, nice libraries, good online documentation, and lots of people in the industry using it. OOP Java With a growing community of Scala on forums, it’s not difficult to find an answer to any Scala questions, which adds to your learning experience. Conclusion Once you start learning Scala, I am sure you will LOVE IT. It’s not only got a cleaner OO code but also functional capabilities, it feels dynamic (like Python) but it also has a static type system that can prevent you from doing bad things. If you decide to learn Scala in 2018 or 2019, here are some useful resources for further learning. Beginning Scala Programming Scala: Getting Started By Justin Pihony Scala for Java Developers By Toby Weston Scala for the Impatient Functional Programming in Scala All the best with your journey into the beautiful world of Scala and functional programming. If you have any questions or feedback, please drop a note. If you like this article, then please share with your friends and colleagues, and don’t forget to follow javinpaul on Twitter and in Medium! javinpaul P.S. — If you need some FREE resources, you can check out For Beginner — A #FREE Course to start your Scala journey. Scala Programming Mini Boot camp Scala - Hacker Noon

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10 Reasons to Learn Scala and Functional Programming

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