Download PDF by Richard Warburton: Java 8 Lambdas: Pragmatic Functional Programming
By Richard Warburton
If you’re a developer with middle Java SE talents, this hands-on e-book takes you thru the language adjustments in Java eight prompted by way of the addition of lambda expressions. You’ll research via code examples, workouts, and fluid causes how those nameless features may also help you write basic, fresh, library-level code that solves company problems.
Lambda expressions are a pretty uncomplicated swap to Java, and the 1st a part of the booklet exhibits you ways to take advantage of them competently. Later chapters exhibit you ways lambda services assist you enhance functionality with parallelism, write less complicated concurrent code, and version your area extra correctly, together with construction larger DSLs.
Use workouts in each one bankruptcy that will help you grasp lambda expressions in Java eight quickly
Explore streams, complex collections, and different Java eight library improvements
Leverage multicore CPUs and enhance functionality with facts parallelism
Use suggestions to “lambdify” your latest codebase or library code
Learn useful recommendations for lambda expression unit trying out and debugging
Implement stable ideas of object-oriented programming with lambdas
Write concurrent functions that successfully practice message passing and non-blocking I/O
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Extra info for Java 8 Lambdas: Pragmatic Functional Programming
Example 4-7. Another overloaded method call overloadedMethod((x, y) -> x + y); Overload Resolution | 45 Example 4-8. ” Take a look at Example 4-9. Example 4-9. print("IntPredicate"); } The lambda expression passed into overloadedMethod is compatible with both a normal Predicate and the IntPredicate. There are method overloads for each of these options defined within this code block. In this case, javac will fail to compile the example, complaining that the lambda expression is an ambiguous method call: IntPredicate doesn’t extend any Predicate, so the compiler isn’t able to infer that it’s more specific.
We can overload a method with the BinaryOp erator and an interface that extends it. When calling these methods, Java will infer the type of your lambda to be the most specific functional interface. For example, the code in Example 4-7 prints out IntegerBinaryOperator when choosing between the two methods in Example 4-8. Example 4-7. Another overloaded method call overloadedMethod((x, y) -> x + y); Overload Resolution | 45 Example 4-8. ” Take a look at Example 4-9. Example 4-9. print("IntPredicate"); } The lambda expression passed into overloadedMethod is compatible with both a normal Predicate and the IntPredicate.
The accumulator starts with an initialValue and then gets folded together with each element of the list by calling combine. The things that differ between implementations of this pattern are the initialValue and the combine function. In the original example, we used the first element in the list as our initialValue, but it doesn’t have to be. In order to find the shortest value, our combine returned the shorter track of out of the current element and the accumulator. We’ll now take a look at how this general pattern can be codified by an operation in the Streams API itself.
Java 8 Lambdas: Pragmatic Functional Programming by Richard Warburton