Array of arrays transformation into array of objects

Question

So I have a JSON array of arrays

[ [ "2015", "Honda", "CR-V", "1.5", "Turbo 7-Seater", "Automatic" ], [ "2016", "Mazda", "CX-5", "2.0", "Premium", "Manual" ] ]

And essentially, I need to create a new JSON object using the values in the JSON array plus keys such as below:

{
  "root": {
    "cars": [
      {
        "Year": "2015",
        "Make": "Honda",
        "Model": "CR-V",
        "Engine": "1.5",
        "Submodel": "Turbo 7-Seater",
        "Transmission": "Automatic"
      },
      {
        "Year": "2016",
        "Make": "Mazda",
        "Model": "CX-5",
        "Engine": "2.0",
        "Submodel": "Premium",
        "Transmission": "Manual"
      }
    ]
  }
}

I'm new to JSON and Javascript. Can anyone provide some tips and guidance? Thank you!

There is no such thing as "JSON array of arrays", it's just an array of arrays. Something is either valid JSON or not:) — cbll
– cbll, Commented Sep 5, 2017 at 8:29

cнŝdk · Accepted Answer · 2017-09-05 08:35:30Z

First of all these are Javascript arrays and objects and not JsonArray and JSONObject.

If the object properties are always the same, you can just map the array elements into respective objects:

var results = {
  "root": {
    "cars": arr.map(function(item) {
      return {
        "year": item[0],
        "make": item[1],
        "model": item[2],
        "engine": item[3],
        "submodel": item[4],
        "transmission": item[5]
      }
    })
  }
}

Demo:

var arr = [
  ["2015", "Honda", "CR-V", "1.5", "Turbo 7-Seater", "Automatic"],
  ["2016", "Mazda", "CX-5", "2.0", "Premium", "Manual"]
];

var results = {
  "root": {
    "cars": arr.map(function(item) {
      return {
        "year": item[0],
        "make": item[1],
        "model": item[2],
        "engine": item[3],
        "submodel": item[4],
        "transmission": item[5]
      }
    })
  }
}

console.log(results);

thelonglqd · Accepted Answer · 2017-09-05 08:41:18Z

You can pass your original array to this function to get what you expected. As I know, you said that you're newbie in JS so my solution comes from simplest function (forEach of JS);

var rootObj = [ [ "2015", "Honda", "CR-V", "1.5", "Turbo 7-Seater", "Automatic" ], [ "2016", "Mazda", "CX-5", "2.0", "Premium", "Manual" ] ];


function convert(arr) {
  var result = { root: { cars: [ ] } };
  arr.forEach(function(val) {
    result.root.cars.push({
      "Year": val[0],
      "Maker": val[1],
      "Model": val[2],
      "Engine": val[3],
      "Submodel": val[4],
      "Transmission": val[5]
    })
  });
  return result;
}

// You can test the result with this line of code
var output = convert(rootObj);
console.log('RESULT: ', JSON.stringify(output));

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