检查javascript对象是否具有密钥，如果确实有新密钥替换它

Question

我想看看我的物体是否

{
application: "123 abc"
description: "done"
id: 672372
issueDate: "2008-07-02T00:00:00"
}

具有密钥description（如果有），然后将其替换为information。我该怎么办？

Answer 1

const obj = {...} // => any object

if(obj.hasOwnProperty('description')) {
  obj.information = obj.description;
  delete obj.description;
}

Answer 2

简单方法：

var obj = {
  application: "123 abc",
  description: "done",
  id: 672372,
  issueDate: "2008-07-02T00:00:00"
}
console.log('before' + obj['application']);
if(obj['application']) {
  obj['application'] = 'new value';
}

console.log('after' + obj['application']);

Answer 3

使用解构和重命名财产。这样可以避免更改当前对象。

obj = {
  application: "123 abc",
  description: "done",
  id: 672372,
  issueDate: "2008-07-02T00:00:00",
};

const update = ({ description: information, ...rest }) =>
  Object.assign(rest, information ? { information } : {});

console.log(update(obj));

console.log(update({id: 2}));