lambda : Java Glossary

Church’s abstraction of function calls. Delegate objects in Java were always considerably more clumsy than C/C++’s callbacks or closures in Smalltalk, even though they were more generic, allowing multiple callbacks and variables to be passed as a single delegate bundle. Java’s delegates also had the advantage of structure, implementing an interface. With Java 1.8, Oracle decided to streamline delegates and allow you to pass little hunks of code as parameters. These are formally called lambda λ expressions or closures. You would think this could be adequately explained in a paragraph or two, however, there are now entire books on them. I have not yet experimented with them, so, for now, I will have to refer you to these books.

Lambdas are not quite the same an anonymous classes. They don’t have a reference to the enclosing class, for example. This allows for speed optimisations, especially when there are multiple threads.

Java implemented just a small part of lambda calculus. It left out monads, lazy evaluation, extended immutability.

Why all the fuss over a terser delegate syntax? They make it easier to encapsulate code for processing entire collections in parallel.

Books

Book referral for Java 8 Lambdas: Pragmatic Functional Programming

	recommend book⇒Java 8 Lambdas: Pragmatic Functional Programming
	by	Richard Warburton	978-1-4493-7077-0	paperback
	publisher	O’Reilly	978-1-4493-7085-5	eBook
	published	2014-04-07	B00J3B3J3C	kindle
Explanation of lambda expressions aka closures added in Java 1.8. There expressions have been integrated into all parts of Java. This book will help you explore these ramification such as streams, parallelism, concurrency, Collections. The book presumes your are already familiar with other parts of the Java language. This book might be described as lambda immersion. The author rarely shows traditional code then the lambda code equivalent. His examples never show output, so you have no way of verifying if you understood what the code did. For the most part, he talks in abstract academic language, which I found hard to understand. I will have to read this book several times before I understand it. On other hand, I wrote a little bit of code to iterate over a Map with a lambda expression and it worked first time and I fully understood how it worked. You can download the exercises from GitHub I bought an eBook copy of this book on 2014-07-18.
Online bookstores carrying Java 8 Lambdas: Pragmatic Functional Programming abe books anz abe books.ca abe books.de amazon.ca amazon.de Chapters Indigo amazon.es Chapters Indigo eBooks iberlibro.com abe books.com abe books.fr amazon.com amazon.fr Barnes & Noble abe books.it Nook at Barnes & Noble amazon.it Kobo junglee.com Google play abe books.co.uk O’Reilly Safari amazon.co.uk Powells other stores
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Book referral for Functional Programming in Java: Harnessing the Power Of Java 8 Lambda Expressions

	recommend book⇒Functional Programming in Java: Harnessing the Power Of Java 8 Lambda Expressions
	by	Venkat Subramaniam	978-1-937785-46-8	paperback
	birth	1966 age:51	B00J8W0OTI	kindle
	publisher	Pragmatic Bookshelf
	published	2014-03-01
This is not just about a new wrinkle to Java syntax, but a whole new functional programming style.
Online bookstores carrying Functional Programming in Java: Harnessing the Power Of Java 8 Lambda Expressions abe books anz abe books.ca abe books.de amazon.ca amazon.de Chapters Indigo amazon.es Chapters Indigo eBooks iberlibro.com abe books.com abe books.fr amazon.com amazon.fr Barnes & Noble abe books.it Nook at Barnes & Noble amazon.it Kobo junglee.com Google play abe books.co.uk O’Reilly Safari amazon.co.uk Powells other stores
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Videos

Implementing Lambda Expressions in Java 

Lambda Speed Considerations 

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