javascript - 在数组中查找重复对象并标记这些 [Javascript lodash]

Question

我有一个包含对象的数组:

var test = [
	{
  	type: "home",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home",
    name: "Some one else home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home1",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  }
];

我想标记它们是重复的对象，像这样(注意额外的属性，isDuplicate):

var test = [
	{
  	type: "home",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home",
    name: "Some one else home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity",
    isDuplicate: true
  },
	{
  	type: "home1",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity"
  },
	{
  	type: "home",
    name: "My home",
    country: "DE",
    postalZone: "1234",
    cityName: "GermanCity",
    isDuplicate: true
  }
];

如果上述值之一发生变化(type、name、country、postalZone 或 cityName)，则该对象是唯一的。

出于测试目的，我尝试了以下方法。仅获取“类型”的唯一对象对我不起作用，例如

_.uniq(test, "type");

还是得到所有的数组对象。当然，我想检查更多对象键，不仅是类型，还有所有对象键(类型、名称、国家/地区、postalZone 或 cityName)。

原生数组函数“some”，如果找到第一个重复项就停止，对我来说它不应该停止...

我怎样才能做到这一点？

我有 Lodash v4.13.1。

Answer 1

这是一个使用 map() 来更改对象的解决方案，如果它被发现是重复的，并且为了找到重复项，我使用了 find() 和 isEqual()。因此，如果找到重复项，它将添加属性，如果没有，它将只返回对象。

var test = [{
  type: "home",
  name: "My home",
  country: "DE",
  postalZone: "1234",
  cityName: "GermanCity"
}, {
  type: "home",
  name: "Some one else home",
  country: "DE",
  postalZone: "1234",
  cityName: "GermanCity"
}, {
  type: "home",
  name: "My home",
  country: "DE",
  postalZone: "1234",
  cityName: "GermanCity"
}, {
  type: "home1",
  name: "My home",
  country: "DE",
  postalZone: "1234",
  cityName: "GermanCity"
}, {
  type: "home",
  name: "My home",
  country: "DE",
  postalZone: "1234",
  cityName: "GermanCity"
}];


var result = _.map(test, function(o, i) {
  var eq = _.find(test, function(e, ind) {
    if (i > ind) {
      return _.isEqual(e, o);
    }
  })
  if (eq) {
    o.isDuplicate = true;
    return o;
  } else {
    return o;
  }
})

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>