Javaslang collection operation guide

JavaSlang is a functional programming library that provides a set of powerful and easy to use collection operations.This guide will introduce some of the commonly used collection operations in Javaslang and explain its usage through the Java code example. 1. Create a collection: Javaslang provides several different types of sets, such as list (list), set (set) and Map (mapping).The following is a sample code for creating these sets: List<Integer> list = List.of(1, 2, 3, 4, 5); Set<String> set = HashSet.of("John", "Jane", "Alice"); Map<String, Integer> map = HashMap.of("key1", 1, "key2", 2); 2. Collection conversion: Javaslang provides many methods for converting collection.You can use these methods to generate another collection from one set, or filter and mapping the collection.Here are some examples: List <strong> names = list.map (object :: Tostring); // Convert the integer list to a string list Set <integer> Evennumber = list.filter (x-> x % 2 == 0); // filter out the even number MAP <string, String> UppercaseMap = MAP.MAPVALUES (String :: Touppercase); // Convert the mapping value to uppercase 3. Collection operation: Javaslang also provides some collection operation methods, such as sorting, aggregation and search.Here are some examples: list.sorted (); // Sort the list list.fold (0, (x, y) -> x + y); // set.Reduce ((x, y) -> x + "and" + y); // merge the elements in the collection into a string map.getorelse ("key", () -> "default"); // Get the value of the given key in the mapping, if the key does not exist, return the silent recognition value value 4. Collection and combination: Javaslang provides some methods for combining collection, such as merging and connection.Here are some examples: List <integer> Combinedlist = list.appendall (list.of (6, 7, 8)); // Merge two lists Set <string> unionset = set.union (hashset.of ("bob", "alice"); // Map <string, Integer> MERGEDMAP = MAP.Merge (HashMap.of ("Key2", 5); // Merge the two mapping merged This is just a small part of the Javaslang collection operation.You can find more detailed information and methods in Javaslang's official documentation. I hope this guide will help you learn and use the Javaslang collection operation!