如何过滤掉数组数组中的公共数组[重复]

Question

我有一个数组数组：

[
  [
    "Serta",
    "Black Friday"
  ],
  [
    "Serta",
    "Black Friday"
  ],
  [
    "Simmons",
    "Black Friday"
  ],
  [
    "Simmons",
    "Black Friday"
  ],
  [
    "Simmons",
    "Black Friday"
  ],
  [
    "Simmons",
    "Black Friday"
  ]
]

我只需要获取唯一的数组，例如：

[
  [
    "Serta",
    "Black Friday"
  ],
  [
    "Simmons",
    "Black Friday"
  ] 
]

我知道对于单个数组元素，我可以使用 .filter() 之类的：

array.filter((d,i)=>array.indexOf(d)==i)

但我不确定这种情况，没有像 lodash 这样的库。

Answer 1

您可以将JSON 字符串作为哈希表中数组的键并使用它进行过滤。

var data = [["Serta", "Black Friday"], ["Serta", "Black Friday"], ["Simmons", "Black Friday"], ["Simmons", "Black Friday"], ["Simmons", "Black Friday"], ["Simmons", "Black Friday"]],
    hash = Object.create(null),
    result = data.filter(a => !hash[JSON.stringify(a)] && (hash[JSON.stringify(a)] = true));

console.log(result);