Weidig Ben - A Functional Approach To Java. Augmenting Object-Oriented Java Code With Functional Principles.pdf

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A Functional Approach to Java
Augmenting Object-Oriented Code with Functional
Principles
Ben Weidig
A Functional Approach to Java
by Ben Weidig
Copyright © 2023 Benjamin Weidig. All rights reserved.
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May 2023: First Edition
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2023-05-09: First Release
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978-1-098-10992-9
[LSI]
Preface
A mind that is stretched by a new experience can never go back to its old
dimensions.
—Oliver Wendell Holmes, Jr.
Developing software is quite a complex endeavor. As Java developers, we
usually try to tame this complexity with object-oriented programming
(OOP) as a metaphor to represent the things we are developing, such as data
structures, and use a primarily imperative-focused coding style to handle
our program’s state. Although OOP is a well-known and battle-tested
approach to developing sensible software, not every problem is a good
match for it. We might introduce a certain amount of unnecessary
complexity by forcing OOP principles on every problem instead of using
more appropriate tools and paradigms also available to us. The functional
programming (FP) paradigm offers an alternative approach to solving
problems.
Functional programming isn’t a new idea. In fact, it’s even older than
object-oriented programming! It first appeared in the early years of
computing, in the 1950s, in the
Lisp
1
programming language and has been
used quite commonly in academia and niche fields. In recent years,
however, there has been an increasing interest in functional paradigms.
Many new functional languages have emerged, and non-functional
languages are including functional features to various degrees. The ideas
and concepts behind FP are now adopted in almost every mainstream
multiparadigm and general-purpose language, allowing us to use some form
of functional programming regardless of the context and chosen language.
Nothing stops us from taking the best parts of FP and augmenting our
existing way of programming and software development tools—and that’s
what this book is about!

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