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

If you are ok to use a library, try lodash uniqWith. This will recursively find groups of arrays OR objects with the comparator of your choice: equal in your case.

var arrayofarrays = [ [1,1,2], [1,2,1], [1,1,2], [1,2,1], [2,1,1], [2,1,1] ]

const uniqarray = _.uniqWith(arrayofarrays, _.isEqual);

console.log(uniqarray) //=> [[1, 1, 2], [1, 2, 1], [2, 1, 1]]

Bonus: it works on array of objects too

var objects = [{ 'x': 1, 'y': {b:1} }, { 'x': 1, 'y': {b:1} }, 
               { 'x': 2, 'y': {b:1} }, { 'x': 1, 'y': 2 }     ];

const uniqarray = _.uniqWith(objects, _.isEqual);

console.log(uniqarray) 
// => [{x: 1, y: {b: 1}}, {x: 2, y: {b: 1}}, {x: 1, y: 2}]