HarmonyOS 鸿蒙Next 遍历数组里的对象 找到包含某个属性的对象

发布于 1周前 作者 songsunli 来自 鸿蒙OS

HarmonyOS 鸿蒙Next 遍历数组里的对象 找到包含某个属性的对象

for (let index = 0; index < obj.length; index++) {
if (obj[index].district.concat(‘北京’)) {
LogUtil.error(“找到北京=” + obj[index].district)
LogUtil.error(“找到北京 cody=” + obj[index].district_geocode)
}
}
java里有contains方法,遍历找到对象里包含的属性,鸿蒙里我没有找到相应的办法,请问一下有什么解决办法嘛?

Harmonyos Next教程
2 回复 
interface CatInfo {
  age: number;
  name: string;
}

let cat1: CatInfo = { age: 10, name: "red" };
let cat2: CatInfo = { age: 5, name: "real" };
let cat3: CatInfo = { age: 16, name: "ren" };

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Index {
  [@State](/user/State) message: string = 'Hello World';
  arr: Array<CatInfo> = [cat1, cat2, cat3]

  build() {
    Column() {
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .onClick(() => {
          for (let index = 0; index < this.arr.length; index++) {
            let aaa: ESObject = this.arr[index]
            console.log("aaaaaaa" + aaa)
            if (aaa['name'].includes("re")) {
              console.log("我找到小猫red了！！")
            }
          }
          let StringA: string = 'test';
          let StringAB: string = 'newtest'
          let isContain: boolean = StringAB.includes(StringA)
          console.log('isContain：' + isContain)
        })

    }
    .height('100%')
    .width('100%')
  }
}

在HarmonyOS鸿蒙Next中遍历数组并查找包含特定属性的对象，你可以使用JavaScript（如果在JS环境中开发应用）或Java（如果在Java环境中开发应用）。以下是两种语言的示例代码：

JavaScript示例

let array = [{id: 1, name: 'Alice'}, {id: 2, name: 'Bob'}, {id: 3, name: 'Charlie'}];
let targetId = 2;

let result = array.find(obj => obj.id === targetId);

if (result) {
    console.log('Found object:', result);
} else {
    console.log('Object not found');
}

Java示例

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

class MyObject {
    int id;
    String name;

    MyObject(int id, String name) {
        this.id = id;
        this.name = name;
    }
}

public class Main {
    public static void main(String[] args) {
        List<MyObject> array = new ArrayList<>();
        array.add(new MyObject(1, "Alice"));
        array.add(new MyObject(2, "Bob"));
        array.add(new MyObject(3, "Charlie"));

        int targetId = 2;
        Optional<MyObject> result = array.stream().filter(obj -> obj.id == targetId).findFirst();

        if (result.isPresent()) {
            System.out.println("Found object: " + result.get());
        } else {
            System.out.println("Object not found");
        }
    }
}

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