在javascript中设置对象的默认值

const obj = {
  name: 'John',
  age: 30,
  address: ''
};

const defaultValues = {
  name: 'Unknown',
  age: 0,
  address: 'No address provided'
};

const filledObj = {
  name: obj.name || defaultValues.name,
  age: obj.age || defaultValues.age,
  address: obj.address || defaultValues.address
};

console.log(filledObj);
// 输出: { name: 'John', age: 30, address: '' }

const obj = {
  name: 'John',
  age: 30,
  address: ''
};

const defaultValues = {
  name: 'Unknown',
  age: 0,
  address: 'No address provided'
};

const filledObj = {
  name: obj.name ?? defaultValues.name,
  age: obj.age ?? defaultValues.age,
  address: obj.address ?? defaultValues.address
};

console.log(filledObj);
// 输出: { name: 'John', age: 30, address: '' }

const obj = {
  name: 'John',
  age: 30,
  address: ''
};

const defaultValues = {
  name: 'Unknown',
  age: 0,
  address: 'No address provided'
};

function getDefaultValue(key) {
  return obj[key] === undefined || obj[key] === null || obj[key] === '' ? defaultValues[key] : obj[key];
}

const filledObj = {
  name: getDefaultValue('name'),
  age: getDefaultValue('age'),
  address: getDefaultValue('address')
};

console.log(filledObj);
// 输出: { name: 'John', age: 30, address: '' }

const obj = {
  name: undefined, // 显式设置为undefined
  age: 30,
  address: ''
};

const filledObj = {
  name: obj.name ?? 'Unknown', // 使用空值合并运算符
  age: obj.age ?? 0,
  address: obj.address ?? 'No address provided'
};

console.log(filledObj);
// 输出: { name: 'Unknown', age: 30, address: '' }