Return unique array values from an array inside an array of objects

Question

I can\'t find a similar question and I\'m a bit stuck. I have the following JSON array:

[
    {
        \"Name\": \"element1\",
        \"Attributes\": [\"1\         


        

Answer 1

You have answers to choose from. Just for fun: this one uses es6

"use strict";
let uniqueAttr = [];
const obj = [
    {
        "Name": "element1",
        "Attributes": ["1", "2"]
    },

    {
        "Name": "element2",
        "Attributes": ["1","3" ]
    },
    {
        "Name": "element3",
        "Attributes": []
    }
];

obj.forEach( element => 
  element.Attributes.forEach( 
    attr => uniqueAttr.indexOf(attr) < 0  && uniqueAttr.push(attr)
  ) 
);

document.querySelector("#result").textContent = uniqueAttr;