Voilà, that’s it, nothing more, nothing less. Therefore, let’s keep it simple and use that predefined name to create this new file, in a new folder src/resources/, with the following JSON content: Per default, the configuration library will try to load a file called application.json as source for the properties. We could now move on to the next step and create our JSON property file. src/resources maven-shade-plugin 3.2.0 package shade In Scala, the enums are created by extending an abstract class Enumeration which is defined here. The enums in Scala work similar to enum in other programming languages like C/C++, Java. Moreover, we should also add the following and goals to our to be able to load the JSON file (we are about to create) and to package the dependency we just referenced within our JAR file. Enumeration is a feature of Scala that is used to define a group of named constants accessed using the enum name and ids. One big advantage of using case objects is that matching will result in warnings if we miss a case. footprint of four competing ways to define enums (Java enums, scala. There is also no attribute access either. To support the concept of enumerations in the Scala programming language, there is a built-in Enumeration class. This group consists of similar types of values. What I notice is that enum is not yet a monad, so there is no flatMap and get, and there is no predefined apply and unapply function. An enumeration in Scala is defined as a group of named constants. Enum compareTo () The compareTo () method compares the enum constants based on their ordinal value. There is a competing style of enum in Scala: based on a case object.If youre already familiar with case classes (you should be if youre reading and understanding this), then you will probably know that a case object is just like a case class but has no parameters. Updated draft to reflect current state of the art, Scala.js POV added. I am trying out Scala3 enum, and it seems to be similar to case classes. For example, ordinal (SMALL) // returns 0. As I began a large project several months ago, I decided to try and get the Scala enumeration problem solved again. finds the values and labels of an enumeration and a mapping to go from a value to its label and vice versa. I have so longed for Java’s Enum in Scala (without having to created Scala/Java mixed project and resorting to using Java’s Enum). Java Enum ordinal () The ordinal () method returns the position of an enum constant. Yet another enumeration toolbox for Scala, powered by shapeless. To use the library, let’s add this library’s new dependency to our pom.xml: com.typesafe config 1.3.4 There are some predefined methods in enum classes that are readily available for use. It leverages all the work of reading JSON files and accessing their properties, has no dependencies, and is even compatible with Java 8.įor once at least, Googling a solution was an excellent idea. That’s why I tried to find a ready-to-go solution online and found the incredible open-source library,. At first, I implemented a quick custom solution but I wasn’t, at all, happy enough with the outcome.
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