The best practical guide to the UNDERSCORE framework in the Java library

The UNDERSCORE framework is a powerful Java class library that provides many practical tool functions for simplifying code and increasing code readability.This article will introduce the best practice of the UNDERSCORE framework, including examples and precautions for usage of common functions. 1. Introduction The UNDERSCORE framework is a very popular tool library in the Java class library, which provides us with a practical function of many functional programming.Its functions include collection operations, object operations, function operations, etc., which can help us handle data and write simple code. Second, use the Underscore framework 1. Introduce the UNDERSCORE framework Before using the Underscore framework, you need to introduce its dependence in the project.You can import tools through Maven or Gradle to import the Underscore framework. 2. Collection operation The UNDERSCORE framework provides a wealth of collection operation functions, which can be processed to list, set, MAP and other sets.The following are several commonly used collection operation examples: a) Traversing collection UNDERSCORE provides an EACH function to traverse each element in the set and operate it. List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); _.each(numbers, number -> System.out.println(number)); b) Filter collection UNDERSCORE provides a Filter function to filter elements in the set according to a certain condition. List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); List<Integer> evenNumbers = _.filter(numbers, number -> number % 2 == 0); c) Map collection UNDERSCORE provides a map function to mappore the elements in the set. List<String> names = Arrays.asList("Alice", "Bob", "Charlie"); List<Integer> nameLengths = _.map(names, name -> name.length()); 3. Object operation The UNDERSCORE framework also provides some convenient object operation functions, such as cloned objects, mergers, etc. a) clone object Underscore provides a Clone function for a cloning object. Person person = new Person("Alice", 25); Person clonedPerson = _.clone(person); b) Merge object UNDERSCORE provides an Extend function to merge multiple objects into a new object. Person person = new Person("Alice", 25); Map<String, Object> additionalProperties = new HashMap<>(); additionalProperties.put("address", "123 Main St"); Person mergedPerson = _.extend(person, additionalProperties); 4. Function operation The UNDERSCORE framework also provides some convenient function operation functions, such as functions of functions, function Corride, etc. a) Function UNDERSCORE provides a Throttle function to control the call frequency of the function. Runnable task = () -> System.out.println("Task executed"); Runnable Throttledtask = _.throttle (TASK, 1000); // Call Task every 1 second b) Function Corry Underscore provides a Curry function to convert a function with multiple parameters into multiple functions with a single parameter. BiFunction<Integer, Integer, Integer> add = (a, b) -> a + b; Function<Integer, Function<Integer, Integer>> curriedAdd = _.curry(add); Curriedadd can be used like the following: int Result = Curriedadd.apply (1) .apply (2); // The result is 3 Third, precautions 1. Avoid excessive use of the Underscore framework Although the Underscore framework provides a lot of practical functions, we must also pay attention to avoid excessive use.In some simple scenarios, using the native Java code may be clearer and efficient. 2. Learn official documents and examples The UNDERSCORE framework has richer documents and examples. We can learn more about the functions and usage of the UNDERSCORE framework by reading official documents and examples. 3. Combined with the Stream API of Java 8+ If your project uses the Java 8 or higher version, it is strongly recommended to combine the Java 8's Stream API to handle the collection operation.Java 8's Stream API provides more intuitive and powerful collection operation functions. The above is the best practical guide to the Underscore framework. I hope it will be helpful to your Java development.Remember that when using the Underscore framework, choose the appropriate function according to the actual situation, and combine specific project needs to determine whether to use it.