Use Lodash framework to optimize objects
Use Lodash framework to optimize objects
Lodash is a very popular JavaScript tool library that provides many functions for simplifying and optimizing object processing.Not only in JavaScript, Lodash can also be used in Java.This article will introduce how to use the Lodash framework optimization object processing and provide some Java code examples.
I. Install Lodash
First, make sure that the Lodash framework has been introduced in your project.It can be implemented by introducing Lodash dependencies or directly downloading and adding Lodash libraries in the project.
II. Use the Lodash function
1. Object merger
Lodash provides the `Merge` function to merge objects.This function can merge one or more objects according to the attribute and return the result of the merger.
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
import org.apache.commons.lang3.StringUtils;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
public class Main {
public static void main(String[] args) throws IOException, JSONException {
JSONObject object1 = new JSONObject("{\"name\":\"John\",\"age\":30}");
JSONObject object2 = new JSONObject("{\"country\":\"China\",\"address\":\"Beijing\"}");
JSONObject mergedObject = new JSONObject(StringUtils.join(object1, object2));
System.out.println(mergedObject.toString(2));
}
}
In the above code, we use Lodash's `Merge` function to merge the` Object1` and `Object2` objects and print the results to the console.
2. Object cloning
Sometimes we need to create a copy of an object. At this time, we can use Lodash's `Clone` function.
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
public class Main {
public static void main(String[] args) {
Person person = new Person("John", 30);
Person clonedPerson = clone(person);
System.out.println(clonedPerson.toString());
}
public static <T> T clone(T source) {
return (T) ToStringBuilder.reflectionToString(source, ToStringStyle.JSON_STYLE);
}
}
In the above example, we use the Lodash's `Clone` function to copy the` Person` object and print the copy results to the console.
3. Object attribute extraction
Sometimes we only need a part of the attribute in the object, and we can use the Lodash's `Pick` function to extract the specified property of the object.
import java.util.Map;
public class Main {
public static void main(String[] args) {
Map<String, Object> person = Map.of("name", "John", "age", 30, "country", "China", "address", "Beijing");
Map<String, Object> pickedProperties = pick(person, "name", "age");
System.out.println(pickedProperties.toString());
}
public static Map<String, Object> pick(Map<String, Object> source, String... properties) {
return Arrays.stream(properties)
.filter(source::containsKey)
.collect(Collectors.toMap(key -> key, source::get));
}
}
In the above code, we extracted the `Name` and` Age` attributes using Lodash's `Pick` function from the` Person` object, and print the extraction result to the console.
These are just some common functions provided by the Lodash framework, and many other functions can be used to optimize object processing.
in conclusion
The Lodash framework provides some very useful functions for processing objects, which can simplify code and improve development efficiency.Whether in JavaScript or Java, Lodash is a good choice.By using the functions provided by Lodash, we can handle the objects more easily to achieve more efficient code writing.
