如何过滤掉数组数组中的公共数组

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"
  ]
]

我只需要获得唯一的数组，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()，如：

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

但是我不确定这个案例，没有像lodash这样的库。

Answer 1

您可以将一个JSON字符串作为哈希表中数组的键并使用它进行过滤。

＆＃13;

＆＃13;

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);

＆＃13;

＆＃13;

＆＃13;