Question

我想从整个firstName对象获得lastName和user属性。我也需要使用条件语句。该怎么做？

getUserById(id)和getUserByAddress(id)使用JavaScript find()方法返回元素或undefined。

let { firstName, lastName } = getUserById(id);
if ({ firstName, lastName } === undefined) {
  { firstName, lastName } = getUserByAddress(id);
}
return `${firstName} ${lastName}`;

Answer 1

const { firstName, lastName } = getUserById(id) || getUserByAddress(id) || {};
if (firstName && lastName) {
    return `${firstName} ${lastName}`;
}
return "Unknown user";

如果getUserById(id)虚假，将执行getUserByAddress(id)。如果这也是虚假的，{}至少将防止引发错误。

JavaScript：使用条件语句进行解构

1 个答案: