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

var uniqueArr = [];

var arr = [
    {
        "Name": "element1",
        "Attributes": ["1", "2"]
    },

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

arr.forEach(function(obj) {
   var attr = obj.Attributes;
   attr.forEach(function(val){
       if (uniqueArray.indexOf(val) < 0) {
           uniqueArray.push(val)
       }
   });
})