Map/Set to maintain unique array of arrays, Javascript

Question

I am trying to build unique array of arrays such that whenever I have new array to add it should only add if it doesn\'t already exist in collection

E.g. store all un

Answer 1

One way would be to convert the arrays to JSON strings, then use a Set to get unique values, and convert back again

var arr = [
  [1, 1, 2],
  [1, 2, 1],
  [1, 1, 2],
  [1, 2, 1],
  [2, 1, 1],
  [2, 1, 1]
];

let set  = new Set(arr.map(JSON.stringify));
let arr2 = Array.from(set).map(JSON.parse);

console.log(arr2)