Groovy
Groovy is a dynamic, object-oriented programming language for the Java Virtual Machine (JVM) that combines features from languages like Python, Ruby, and Smalltalk. It is designed to enhance Java with scripting capabilities, concise syntax, and powerful features such as closures and metaprogramming. Groovy is often used for scripting, testing, and building applications in Java environments.
Developers should learn Groovy when working in Java ecosystems that require rapid prototyping, scripting, or domain-specific languages (DSLs), such as in Gradle build scripts or Apache Groovy-based frameworks like Grails. It is particularly useful for simplifying Java code, writing concise tests with frameworks like Spock, and automating tasks in continuous integration pipelines.