如何检查两个对象是否具有相同的属性名称集？ [英] How can I check that two objects have the same set of property names?

问题描述

我正在为我的应用程序使用node，mocha和chai。我想测试我的返回结果数据属性与我的模型对象之一是对象类型。 （与柴的实例非常相似）。我只是想确认这两个对象具有相同的属性名称集。 我对这些属性的实际价值并不感兴趣。

I am using node, mocha, and chai for my application. I want to test that my returned results data property is the same "type of object" as one of my model objects. (Very similiar to chai's instanceof). I just want to confirm that the two objects have the same sets of property names. I am specifically not interested in the actual values of the properties.

让我说我的模型人如下。我想检查我的results.data是否具有与预期模型相同的属性。所以在这种情况下，Person有一个firstName和lastName。

Lets say I have the model Person like below. I want to check that my results.data has all the same properties as the expected model does. So in this case, Person which has a firstName and lastName.

所以如果 results.data.lastName 和 results.data.firstName 两者都存在，那么它应该返回true。如果其中任何一个不存在，则应返回false。如果results.data具有任何其他属性（如results.data.surname），那么它将返回false，因为姓氏在Person中不存在。

So if results.data.lastName and results.data.firstName both exist, then it should return true. If either one doesn't exist, it should return false. A bonus would be if results.data has any additional properties like results.data.surname, then it would return false because surname doesn't exist in Person.

模型

function Person(data) {
  var self = this;
  self.firstName = "unknown";
  self.lastName = "unknown";

  if (typeof data != "undefined") {
     self.firstName = data.firstName;
     self.lastName = data.lastName;
  }
}

推荐答案

你可以序列化简单数据以检查是否相等：

You can serialize simple data to check for equality:

data1 = {firstName: 'John', lastName: 'Smith'};
data2 = {firstName: 'Jane', lastName: 'Smith'};
JSON.stringify(data1) === JSON.stringify(data2)

这将给你类似的东西

'{firstName:"John",lastName:"Smith"}' === '{firstName:"Jane",lastName:"Smith"}'

作为一个函数......

As a function...

function compare(a, b) {
  return JSON.stringify(a) === JSON.stringify(b);
}
compare(data1, data2);

编辑

如果您正在使用像你说的那样，请查看 http://chaijs.com/api/bdd/#equal-section

如果你只是想检查钥匙......

If you just want to check keys...

function compareKeys(a, b) {
  var aKeys = Object.keys(a).sort();
  var bKeys = Object.keys(b).sort();
  return JSON.stringify(aKeys) === JSON.stringify(bKeys);
}

应该这样做。

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