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

To get around the problem of each array being a unique object, you can stringify it so it's no longer unique, then map it back to an array later. This should do the trick:

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


var unique = arr.map(cur => JSON.stringify(cur))
  .filter(function(curr, index, self) {
    return self.indexOf(curr) == index;
  })
  .map(cur => JSON.parse(cur))

console.log(unique);