如何从JavaScript对象中精确提取指定属性

const someObject = { number: '1', month: 'march', year: '2023' };
const propertiesToExtract = ['month', 'year']; // 这是一个包含要提取属性名称的数组

// 1. 将对象转换为键值对数组
const entries = Object.entries(someObject);
// entries 将是: [['number', '1'], ['month', 'march'], ['year', '2023']]

// 2. 筛选出目标属性
const filteredEntries = entries.filter(([key, value]) => propertiesToExtract.includes(key));
// filteredEntries 将是: [['month', 'march'], ['year', '2023']]
// 这里，我们使用数组解构 `[key, value]` 来方便地访问每个键值对的键。
// `propertiesToExtract.includes(key)` 检查当前键是否在我们的目标列表中。

// 3. 将筛选后的键值对数组转换回对象
const finalObject = Object.fromEntries(filteredEntries);

console.log(finalObject);
// 预期输出: { month: 'march', year: '2023' }

const someObject = { number: '1', month: 'march', year: '2023' };
const propertiesToExtract = ['month', 'year'];

const finalObject = Object.fromEntries(
  Object.entries(someObject).filter(([key, value]) => propertiesToExtract.includes(key))
);

console.log(finalObject); // { month: 'march', year: '2023' }

const someObject = { number: '1', month: 'march', year: '2023' };
const propertiesAsString = 'month, year';

// 将字符串转换为数组
const propertiesToExtractFromString = propertiesAsString.split(', ').map(prop => prop.trim());
// propertiesToExtractFromString 将是: ['month', 'year']

const finalObjectFromString = Object.fromEntries(
  Object.entries(someObject).filter(([key, value]) => propertiesToExtractFromString.includes(key))
);

console.log(finalObjectFromString); // { month: 'march', year: '2023' }