Deep Flatten JavaScript Object Recursively

Question

Data:

var data = [
    {
      \"id\": 1,
      \"level\": \"1\",
      \"text\": \"Sammy\",
      \"type\": \"Item\",
      \"items\": [
               


        

Answer 1

Here is solution using recursive function which I called flattenNestedObjectsArray()(for native JavaScript):

function flattenNestedObjectsArray(arr, part){
    var flattened = part || [], items;
    arr.forEach(function(v){
        if (Array.isArray(v.items) && v.items.length) {
            items = v.items;
            v.items = [];
            flattened.push(v);
            flattened.concat(flattened, flattenNestedObjectsArray(items, flattened));                
        } else {
            flattened.push(v);
        }        
    });
    return flattened;
}

var flattened = flattenNestedObjectsArray(data);
console.log(JSON.stringify(flattened, 0, 4));

The console.log output:

[
    {
        "id": 1,
        "level": "1",
        "text": "Sammy",
        "type": "Item",
        "items": []
    },
    {
        "id": 11,
        "level": "2",
        "text": "Table",
        "type": "Item",
        "items": []
    },
    {
        "id": 111,
        "level": "3",
        "text": "Dog",
        "type": "Item",
        "items": null
    },
    {
        "id": 112,
        "level": "3",
        "text": "Cat",
        "type": "Item",
        "items": null
    },
    {
        "id": 12,
        "level": "2",
        "text": "Chair",
        "type": "Item",
        "items": []
    },
    {
        "id": 121,
        "level": "3",
        "text": "Dog",
        "type": "Item",
        "items": null
    },
    {
        "id": 122,
        "level": "3",
        "text": "Cat",
        "type": "Item",
        "items": null
    },
    {
        "id": 2,
        "level": "1",
        "text": "Sundy",
        "type": "Item",
        "items": []
    },
    {
        "id": 21,
        "level": "2",
        "text": "MTable",
        "type": "Item",
        "items": []
    },
    {
        "id": 211,
        "level": "3",
        "text": "MTDog",
        "type": "Item",
        "items": null
    },
    {
        "id": 212,
        "level": "3",
        "text": "MTCat",
        "type": "Item",
        "items": null
    },
    {
        "id": 22,
        "level": "2",
        "text": "MChair",
        "type": "Item",
        "items": []
    },
    {
        "id": 221,
        "level": "3",
        "text": "MCDog",
        "type": "Item",
        "items": null
    },
    {
        "id": 222,
        "level": "3",
        "text": "MCCat",
        "type": "Item",
        "items": null
    },
    {
        "id": 3,
        "level": "1",
        "text": "Bruce",
        "type": "Folder",
        "items": []
    },
    {
        "id": 31,
        "level": "2",
        "text": "BTable",
        "type": "Item",
        "items": []
    },
    {
        "id": 311,
        "level": "3",
        "text": "BTDog",
        "type": "Item",
        "items": null
    },
    {
        "id": 312,
        "level": "3",
        "text": "BTCat",
        "type": "Item",
        "items": null
    },
    {
        "id": 32,
        "level": "2",
        "text": "Chair",
        "type": "Item",
        "items": []
    },
    {
        "id": 321,
        "level": "3",
        "text": "BCDog",
        "type": "Item",
        "items": null
    },
    {
        "id": 322,
        "level": "3",
        "text": "BCCat",
        "type": "Item",
        "items": null
    }
]