Javaslang's lambda expression and method reference function detailed explanation

Javaslang is a powerful functional programming library that provides many exquisite features such as Lambda expression and method reference.In this article, we will explain the functions and methods quoted by Lambda expression and methods in Javaslang in detail, and provide some Java code examples. Lambda expression is an important feature introduced after Java 8, which makes functional programming easier to achieve and use.Lambda expression in Javaslang can be used to create examples of functional interface, which is an interface with only one abstract method.It provides a simple and elegant way to achieve the ability to call back functions and transmission behavior. Below is an example of using Javaslang Lambda expression to demonstrate the filtering string with a length greater than 3 in a string list: import javaslang.collection.List; public class LambdaExample { public static void main(String[] args) { List<String> strings = List.of("apple", "banana", "carrot", "date"); List<String> filteredStrings = strings.filter(s -> s.length() > 3); System.out.println(filteredStrings); } } In the above example, we use lambda expression `s-> s.length ()> 3` as the filter condition, screen out string with a length of greater than 3, and store the result in the` FilteredStrings` variable.Finally, we print the screened string list. In addition to Lambda expression, JavaSlang also supports method reference.Method reference is a more concise way to quote the existing method. It provides a ability to transfer methods in functional programming, rather than directly implementing it as Lambda expression.This makes the code more readable and easy to maintain. Below is a example of using the javaslang method to show how to convert a string list into uppercase letters: import javaslang.collection.List; public class MethodReferenceExample { public static void main(String[] args) { List<String> strings = List.of("apple", "banana", "carrot", "date"); List<String> uppercasedStrings = strings.map(String::toUpperCase); System.out.println(uppercasedStrings); } } In the above example, we use how to quote the `String :: TOUPPERCASE` to convert each string in the string list into uppercase letters, and store the result in the` UpperCasedstrings` variable.Finally, we print out the conversion string list. By using Javaslang's Lambda expression and method reference, we can write function code in a more concise and flexible way.They not only make the code more readable and easy to maintain, but also provide a more powerful and expressive programming method, so that we can better use the advantages of functional programming.