如何从javascript对象中删除空的、未定义的值

function removeEmptyValues(obj) {
  return Object.entries(obj).reduce((acc, [key, value]) => {
    if (value !== null && value !== undefined && value !== '') {
      acc[key] = value;
    }
    return acc;
  }, {});
}

// 示例
const myObj = { a: 1, b: null, c: undefined, d: '' };
const cleanedObj = removeEmptyValues(myObj);
console.log(cleanedObj); // 输出: { a: 1 }

function removeEmptyValues(obj) {
  for (let key in obj) {
    if (obj[key] === null || obj[key] === undefined || obj[key] === '') {
      delete obj[key];
    }
  }
  return obj;
}

// 示例
const myObj = { a: 1, b: null, c: undefined, d: '' };
const cleanedObj = removeEmptyValues(myObj);
console.log(cleanedObj); // 输出: { a: 1 }

const _ = require('lodash');

function removeEmptyValues(obj) {
  return _.pickBy(obj);
}

// 示例
const myObj = { a: 1, b: null, c: undefined, d: '' };
const cleanedObj = removeEmptyValues(myObj);
console.log(cleanedObj); // 输出: { a: 1 }

function deepRemoveEmptyValues(obj) {
  if (Array.isArray(obj)) {
    return obj.filter(item => item !== null && item !== undefined && item !== '').map(deepRemoveEmptyValues);
  } else if (typeof obj === 'object' && obj !== null) {
    return Object.entries(obj).reduce((acc, [key, value]) => {
      const cleanedValue = deepRemoveEmptyValues(value);
      if (cleanedValue !== null && cleanedValue !== undefined && cleanedValue !== '') {
        acc[key] = cleanedValue;
      }
      return acc;
    }, {});
  }
  return obj;
}

// 示例
const myObj = { a: 1, b: { c: null, d: 2 }, e: [null, 3, ''] };
const cleanedObj = deepRemoveEmptyValues(myObj);
console.log(cleanedObj); // 输出: { a: 1, b: { d: 2 }, e: [3] }