Transform object into array with objects

Question

I have the following object:

let obj = {
    "productData": [{
            "id": 0,
            "daily_netProfit": 1.35208688924,
            "daily_grossProfit": 1.35448688924,
            "daily_costs": 0.0024,
            "created_at": "2018-06-18"
        },
        {
            "id": 1,
            "daily_netProfit": 1.35208688924,
            "daily_grossProfit": 1.35448688924,
            "daily_costs": 0.0024,
            "created_at": "2018-06-19"
        }
    ]
}

let dataSet = obj.productData.map((item, i) => [
    item.daily_netProfit,
    item.daily_grossProfit,
    item.daily_costs,
    item.created_at,
])

console.log(dataSet)

As you can see the above map function constructs an array within an array. However, my final result array with objects should look like the following:

[{
        daily_netProfit: 1.35208688924,
        daily_grossProfit: 1.35448688924,
        daily_costs: 0.0024,
        day: "2018-06-18"
    },
    {
        daily_netProfit: 1.35208688924,
        daily_grossProfit: 1.35448688924,
        daily_costs: 0.0024,
        day: "2018-06-19"
    }
],

Is there a map function to construct the above array-object?

I appreciate your replies!

Why don't you just create an object instead of an array as you need to? — Yury Tarabanko
– Yury Tarabanko, Commented Jun 18, 2018 at 11:22

Nina Scholz · Accepted Answer · 2018-06-18 11:29:42Z

You could map an object.

var obj = { productData: [{ id: 0, daily_netProfit: 1.35208688924, daily_grossProfit: 1.35448688924, daily_costs: 0.0024, created_at: "2018-06-18" }, { id: 1, daily_netProfit: 1.35208688924, daily_grossProfit: 1.35448688924, daily_costs: 0.0024, created_at: "2018-06-19" }] },
    dataSet = obj.productData.map(
        ({ daily_netProfit, daily_grossProfit, daily_costs, created_at: day }) =>
            ({ daily_netProfit, daily_grossProfit, daily_costs, day }))

console.log(dataSet)

.as-console-wrapper { max-height: 100% !important; top: 0; }

With rest syntax for objects (for newest JS) even shorter

var obj = { productData: [{ id: 0, daily_netProfit: 1.35208688924, daily_grossProfit: 1.35448688924, daily_costs: 0.0024, created_at: "2018-06-18" }, { id: 1, daily_netProfit: 1.35208688924, daily_grossProfit: 1.35448688924, daily_costs: 0.0024, created_at: "2018-06-19" }] },
    dataSet = obj.productData.map(({ id, created_at: day, ...rest }) => ({ ...rest, day }));

console.log(dataSet);

.as-console-wrapper { max-height: 100% !important; top: 0; }

T.J. Crowder · Accepted Answer · 2018-06-18 11:26:31Z

You're creating arrays rather than objects. Create objects instead. You can use parameter destructuring to pick out hte parts you want, then use an object initializer to create the new object:

let obj = {
  "productData": [{
      "id": 0,
      "daily_netProfit": 1.35208688924,
      "daily_grossProfit": 1.35448688924,
      "daily_costs": 0.0024,
      "created_at": "2018-06-18"
    },
    {
      "id": 1,
      "daily_netProfit": 1.35208688924,
      "daily_grossProfit": 1.35448688924,
      "daily_costs": 0.0024,
      "created_at": "2018-06-19"
    }
  ]
};

let dataSet = obj.productData.map(
  ({
    daily_netProfit,
    daily_grossProfit,
    daily_costs,
    created_at
  }) => ({
    daily_netProfit,
    daily_grossProfit,
    daily_costs,
    created_at
  })
);

console.log(dataSet)

.as-console-wrapper {
  max-height: 100% !important;
}

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