javascript - 从对象数组中获取唯一的对象

Question

我有一个如下所示的对象数组:

[
  {
    "places": "NEW YORK",
    "locations": "USA"
  },
  {
    "places": "MONTREAL",
    "locations": "QUEBEC",
    "country": "Canada"
  },
  {
    "places": "MONTREAL",
    "locations": "QUEBEC",
    "country": "Canada"
  }
]

我想过滤并仅获取唯一的条目。我尝试了以下功能，但不起作用:

function onlyUnique(value, index, self) { 
  return self.indexOf(value) === index;
}

使用Set似乎也不起作用。有什么想法吗？

Answer 1

使用new Set()的简单解决方案。

const data = [
            {
                "places": "NEW YORK",
                "locations": "USA"
            },
            {
                "places": "MONTREAL",
                "locations": "QUEBEC",
                "country": "Canada"
            },
  {
                "places": "MONTREAL",
                "locations": "QUEBEC",
                "country": "Canada"
            },

        ];
        
const uniqueArray = a => [...new Set(a.map(o => JSON.stringify(o)))].map(s => JSON.parse(s));

console.log(uniqueArray(data));