Topic

Groovy

A collection of 53 issues

Groovy - Simplifying null checks with @NullCheck

While null references have their uses in programming, the creator, Tony Hoare, has admitted that creating null references was a billion-dollar mistake. If you consider the method parameters, most of the time, it would be a good idea to ensure that the parameter value is not null. Otherwise, we will

Groovy - Intention revealing code with map constructors

"Effective Java" recommends using static factory methods in Java instead of constructors. One reason for this is that static factory methods do a better job at intention revealing than regular constructors. This is because if you have constructors with many arguments, that too multiple arguments with the same

Effective Java with Groovy - Favour Composition to Inheritance

One of the key lessons from the Gang-of-Four Design Patterns is to favour composition over inheritance to achieve better maintainability in our Object-Oriented design. However, most of the codebases written in Java seem to favour inheritance over composition. The main force behind this is the ease of implementing inheritance with

Effective Java with Groovy - Singleton

Singleton is one of the most popular patterns among the ones from the Gang-of-Four design patterns. Many times, we would require just one instance of a class. Say our application connects to exactly one database; then, we would need one instance of the class that manages database connections. If developers

Ladder of constructors - pattern or anti-pattern?

The ladder of constructors is a popular pattern one can see in Java applications. In this post, let us try to understand where this pattern becomes necessary and what features the programming languages can provide to come out of the ladder of constructors. Context We want to create a class

Effective Java with Groovy - How Language Influences Adoption of Good Practices - ApacheCon@Home 2020

Slides Releated blog posts To learn more about Effective Java with Groovy, refer to the collection of posts here.

What's in Groovy for Functional Programming - ApacheCon 2020

Slides Related blog posts

Effective Java with Groovy

Collection of blog posts on how Groovy improves the developer experience of implementing Effective Java practices. 1. GR8Conf EU Talk 2. When float and double put you in trouble! 3. Are you implementing equals and hashCode correctly? 4. Favour Internal Iterators 5. Enabling Order 6. The (in)famous null 7.

What's in Groovy for Functional Programming

Collection of blog posts on functional programming with Groovy. * Closures * Higher order functions * Currying * Function composition * Pure functions * Immutability * Recursion * Tail call optimisation * Memoization * Collect - map operation * Filter * Reduce * Map filter reduce * Strategy pattern * Command pattern * Execute Around pattern

Groovy Scripts - Reusable Code

Let's start with the following Groovy script which reads and prints all the properties from a file. import java.nio.file.Path Properties loadProperties() { Properties properties = new Properties() Path propertyFilePath = Path.of('my.properties') propertyFilePath.withInputStream { properties.load(it) } properties } Properties properties = loadProperties() properties.each { println