Use javaslang to match the pattern matching
Use javaslang to match the pattern matching
Overview:
Javaslang is a functional programming library that provides a rich functional programming tool and function for Java developers.One of the powerful functions is pattern matching, which allows developers to perform corresponding logic according to different situations.This article will introduce how to use JavaSlang in Java for mode matching.
What is mode matching?
Mode matching is a function that performs different operations according to different mode conditions.It can perform corresponding logic according to different inputs.Mode matching is a technology commonly used in functional programming, which can improve the readability and maintenance of code.
Steps to match the pattern matching with javaslang:
1. Introduce the Javaslang library: First of all, you need to introduce the Javaslang library in the Java project.You can add the following dependencies through building tools such as Maven or Gradle:
dependencies {
compile 'io.vavr:vavr:0.10.2'
}
2. Import the related class of Javaslang: In Java code, you need to import the related classes of the Javaslang library to use the mode matching function.The commonly imported classes include `match` and` case`.
Example -Use mode match to determine the size of the number:
Suppose we need to perform different logic according to the size of different numbers.The following is a sample code that uses Javasla for pattern matching:
import io.vavr.API;
import io.vavr.API.*;
import static io.vavr.API.$;
import static io.vavr.API.Case;
import static io.vavr.API.Match;
public class PatternMatchingExample {
public static void main(String[] args) {
int number = 7;
String result = Match(number).of(
Case ($ (n-> n <0), "negative number"),
Case ($ (n-> n> 0 && n <= 1), "between 0 and 1"),
Case ($ (n-> n> 1 && n <= 10), "between 1 and 10"),
Case ($ (), "Unheard")
);
System.out.println(result);
}
}
In the above example, we use the method of `match` and` case` to implement the pattern matching.Pass the object to be matched in the `match`, and then use the` case` method to set mode conditions and corresponding operations.In this example, we execute the corresponding logic according to different digital range.
Summarize:
Through Javaslang's mode matching function, you can perform the corresponding logic according to different situations to improve the readability and maintenance of the code.When using JavaSlang to match the pattern, you need to import the relevant class, and use the `MATCH` and` Case` methods to set the mode conditions and operations.I hope that through the introduction of this article, you can understand and successfully use Javaslang to match the pattern.
