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.
recommend book⇒Java 8 Lambdas: Pragmatic Functional Programming | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
by | Richard Warburton | 978-1-4493-7077-0 | paperback | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Greyed out stores probably do not have the item in stock. Try looking for it with a bookfinder. |
recommend book⇒Functional Programming in Java: Harnessing the Power Of Java 8 Lambda Expressions | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
by | Venkat Subramaniam | 978-1-937785-46-8 | paperback | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Greyed out stores probably do not have the item in stock. Try looking for it with a bookfinder. |
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