从JavaScript对象中删除falsies

const obj = {
  name: 'John',
  age: 25,
  address: null,
  email: '',
  active: false
};

for (let key in obj) {
  if (!obj[key]) {
    delete obj[key];
  }
}

console.log(obj);
// 输出: { name: 'John', age: 25 }

const obj = {
  name: 'John',
  age: 25,
  address: null,
  email: '',
  active: false
};

const filteredObj = Object.keys(obj).reduce((acc, key) => {
  if (obj[key]) {
    acc[key] = obj[key];
  }
  return acc;
}, {});

console.log(filteredObj);
// 输出: { name: 'John', age: 25 }

const _ = require('lodash');

const obj = {
  name: 'John',
  age: 25,
  address: null,
  email: '',
  active: false
};

const filteredObj = _.pickBy(obj, Boolean);

console.log(filteredObj);
// 输出: { name: 'John', age: 25 }