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Mar 15, 2023 · The Function Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in one argument and produces a result.
Feb 5, 2024 · In this article, you will learn how to use functional programming in Java, and how it differs from imperative and object-oriented programming, which are the dominant paradigms in Java....
- Overview
- The Functional Java Library
- Defining A Function
- Applying A Function
- Filtering Using A Function
- Applying Boolean Logic Using A Function
- Handling Optional Values with A Function
- Reducing A Set Using A Function
- Conclusion
In this tutorial, we’ll provide a quick overview of the Functional Javalibrary along with a few examples.
The Functional Java library is an open source library meant to facilitate functional programming in Java. The library provides lots of basic and advanced programming abstractions commonly used in Functional Programming. Much of the library’s functionality revolves around the F interface. This F interface models a function that takes an input of typ...
Let’s start by creating a function that we can use in our examples later on. Without Functional Java, a basic multiplication method would look something like: Using the Functional Java library, we can define this functionality a little more elegantly: Above, we see an example of the F interface that takes an Integer as input and returns that Intege...
Now that we have our functions in place, let’s apply them to a dataset. The Functional Java library provides the usual set of types for managing data like lists, sets, arrays, and maps. The key thing to realize is that these data types are immutable. Additionally, the library provides convenience functions to convert to and from standard Java Colle...
Another frequently used operation in Functional Programming is to take an input and filter out data based on some criteria. And as you’ve probably already guessed, these filtering criteria are provided in the form of a function. This function will need to return a boolean to indicate whether or not the data needs to be included in the output. Now, ...
In Functional Programming, we frequently use logic like “only do this if all elements satisfy some condition”, or “only do this if at least one element satisfies some condition”. The Functional Java library provides us with shortcuts for this logic through the exists and the forallmethods: In the example above, we used an array of strings as our in...
Handling optional values in code typically requires == null or isNotBlank checks. Java 8 now provides the Optionalclass to handle these checks more elegantly, and the Functional Java library offers a similar construct to deal with missing data gracefully through its Option class:
Finally, we will look at functionality to reduce a set. “Reducing a set” is a fancy way of saying “rolling it up into one value”. The Functional Java library refers to this functionality as folding. A function needs to be specified to indicate what it means to fold the element. An example of this is the Integers.addfunction to show the integers in ...
This article is just a short introduction to the Functional Java library. As always, the full source code of the article is available over on GitHub.
May 11, 2024 · As a subset of declarative programming, functional programming offers several constructs such as higher-order functions, function composition and function chaining. Think of the benefits that Stream API has brought into Java 8 for handling data manipulations.
Aug 7, 2024 · The Function Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in one argument and produces a result.
FunctionalJ.io is a library for writing functional style code in Java. It aims be a practical expansion to functional programming added in Java 8. FunctionalJ.io is a pure Java library with all code written in Java so its usages will be just like other Java library.
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Mar 14, 2023 · In this article, I'll show you examples of how to implement these concepts in Java using modern language features, like “java.util.function.Function”, “java.util.function.BiFunction”, and a user-defined TriFunction. We'll then see how to overcome its limitation using currying.
