How to get new Set from array of arrays by using Array.map function?

Question

Exploring Sets now and could not get a new Set from an array of x arrays in it. I what to use Array.map method inside new Set().

Here is what I'm trying to do, and it seems logical, but in the end having values only from the 1st array:

new Set(...array.map(x => x.value));

Will be awesome to understand what I am doing wrong and how it should look like

Update : To be more clear in my need:

const array = [[1,1,3,4], [2,2,3,4], [1,1,3,5]];
new Set(...array.map(x => x));

My goal to have [1,2,3,4,5] but getting [1,3,4]

Solution :

 new Set(array.map(x => x.value).flat())

Answer 1

You need only the array, not spreaded parameters:

new Set(array.map(x => x.value));

From Set :

Syntax

new Set() new Set(iterable)

With a nested array, you need a flat it first:

 const array = [[1, 1, 3, 4], [2, 2, 3, 4], [1, 1, 3, 5]], unique = new Set(array.flat()), result = [...unique].sort((a, b) => a - b); console.log(...unique); // still a set console.log(...result); // array, sorted