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

You can subclass Set for more flexibility in storing objects by storing the result of calling JSON.stringify on added objects.

class ObjectSet extends Set{
  add(elem){
    return super.add(typeof elem === 'object' ? JSON.stringify(elem) : elem);
  }
  has(elem){
    return super.has(typeof elem === 'object' ? JSON.stringify(elem) : elem);
  }
}
let set = new ObjectSet([[1,1,2],[1,2,1],[1,1,2],[1,2,1],[2,1,1],[2,1,1]]);
console.log([...set]);
console.log([...set].map(JSON.parse));//get objects back