过滤对象，使其仅包含对象数组中存在的键

function filterObjectsByKey(objects, key) {
  return objects.filter(obj => key in obj);
}

const objects = [
  { name: 'John', age: 25 },
  { name: 'Jane' },
  { name: 'Tom', age: 30 }
];
const filteredObjects = filterObjectsByKey(objects, 'age');
console.log(filteredObjects);
// 输出： [{ name: 'John', age: 25 }, { name: 'Tom', age: 30 }]

def filter_objects_by_key(objects, key):
  return [obj for obj in objects if key in obj]

objects = [
  { 'name': 'John', 'age': 25 },
  { 'name': 'Jane' },
  { 'name': 'Tom', 'age': 30 }
]
filtered_objects = filter_objects_by_key(objects, 'age')
print(filtered_objects)
# 输出： [{'name': 'John', 'age': 25}, {'name': 'Tom', 'age': 30}]

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class ObjectFilter {
  public static List<Map<String, Object>> filterObjectsByKey(List<Map<String, Object>> objects, String key) {
    List<Map<String, Object>> filteredObjects = new ArrayList<>();
    for (Map<String, Object> obj : objects) {
      if (obj.containsKey(key)) {
        filteredObjects.add(obj);
      }
    }
    return filteredObjects;
  }

  public static void main(String[] args) {
    List<Map<String, Object>> objects = new ArrayList<>();
    objects.add(Map.of("name", "John", "age", 25));
    objects.add(Map.of("name", "Jane"));
    objects.add(Map.of("name", "Tom", "age", 30));
    List<Map<String, Object>> filteredObjects = filterObjectsByKey(objects, "age");
    System.out.println(filteredObjects);
    // 输出： [{name=John, age=25}, {name=Tom, age=30}]
  }
}