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www.morling.dev | ||
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konradreiche.com
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| | | | | Since most of the Java code I wrote in the past was on Android I was not able to enjoy too many Java 8 features yet. Though recently I wrote a microservice in Java using Spring Boot where I could make full use of lambdas and functional interfaces. The following method, for instance, returns the sum of all transactions for a specified instance by traversing their children. @RequestMapping(value = "/transaction/sum/{id}", method = RequestMethod.GET) BigDecimal Sum sum(@PathVariable long id) { List transactions = new ArrayList<>(); Transaction current = repository.find(id); while (current != null) { transactions.add(current); current = current.getChild(); } return transactions.stream().map(t -> t.getAmount()) .reduce(BigDecimal.ZERO, BigDecimal::add); } As someone who learned Haskell in his freshman year I cannot but love the simplicity. Also, because it is a very common way to express this statement in Ruby. The code above the return statement could not be more imperative and I was wondering whether there is a way to express this in a functional way, too. In Ruby we could possible implement it like this: | |
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www.jrebel.com
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| | | | | What are Java Streams? Are streams only in Java 8? Join us as we explore these questions along with best practices for using streams in development. | |
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winterbe.com
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| | | | | Learn Java 8 streams by example: functional programming with filter, map, flatMap, reduce, collect, lambdas, sequential and parallel streams are covered in-depth in this tutorial. | |
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erik.doernenburg.com
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| | | At work I'm seeing more and more embedded software; over the past few years in, among others, coffee machines, forklifts, and cars. Embedded software needs... | ||
