Javascript Append objects from this array and create new array with object key value pairs appended

Question

I've got an array like

 [{"Color Family":"BEIGE","Dark/Light Main Color":null,"Drop":null,"Embroidery Family":null,"Fabric Family":null,"Fabric weight":null,"Line":null,"Logo":null,"Print/Jacquard Family":null,"Sizing/Fitting":null,"Skull":null},{"Color Family":"BLACK","Dark/Light Main Color":null,"Drop":null,"Embroidery Family":null,"Fabric Family":null,"Fabric weight":null,"Line":null,"Logo":null,"Print/Jacquard Family":null,"Sizing/Fitting":null,"Skull":null},{"Color Family":"BLUE","Dark/Light Main Color":null,"Drop":null,"Embroidery Family":null,"Fabric Family":null,"Fabric weight":null,"Line":null,"Logo":null,"Print/Jacquard Family":null,"Sizing/Fitting":null,"Skull":null},{"Color Family":"CAMEL","Dark/Light Main Color":null,"Drop":null,"Embroidery Family":null,"Fabric Family":null,"Fabric weight":null,"Line":null,"Logo":null,"Print/Jacquard Family":null,"Sizing/Fitting":null,"Skull":null},{"Color Family":"GREEN","Dark/Light Main Color":null,"Drop":null,"Embroidery Family":null,"Fabric 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weight":null,"Line":null,"Logo":null,"Print/Jacquard Family":null,"Sizing/Fitting":null}]

I am trying to display this data in an excel sheet, but there the excel sheet comes like this.

The problem with this array is that the properties that have non null values do not occur with same frequency. For example I have Color Family property appearing 11 times and then let's say Drop appearing 2 times. I've tried to get a solution for this which was to find the key that appears the most with non null value and then concatenate other properties from other objects to it, but no success.

My desired output

[
    {
        "ColorFamily": "BEIGE",
        "Dark/Light Main Color": "Dark",
        "Drop": "DEL1",
        "Embroidery Family": "SATIN STITCH",
        "FabricFamily": "COTTON"
    },
    {
        "ColorFamily": "BLACK",
        "Dark/Light Main Color": "LIGHT",
        "Drop": "DEL2",
        "Embroidery Family": "null",
        "FabricFamily": "COTTON SILK"
    },
    ...
]

Any help would be appreciated.

Answer 1

You need to change the basic_format and input_data, and you will get the desired output using the below-given code.

Note: this is just a code I ran for small reproducible input and output. You can change the data and play around to get the desired final output

function fixMapping(basic_format = {}, input_data = []) {
    // in here we are just creating a map of all the value we have and we will be using index to match the value for different keys
    data_key_mapping = {}
    input_data.map(d => {
        Object.entries(d).map(([key, value]) => {
            if (!data_key_mapping[key]) data_key_mapping[key] = []
            if (value) data_key_mapping[key].push(value)
        })
    })
    
    // using the above mapping to finally outputting the desired output while using index to match the value in different keys and keeping other keys as null
    final_data = []
    Object.entries(data_key_mapping).map(([key, values]) => {
        values.map((value, index) => {
            if (!final_data[index]) final_data[index] = Object.assign({}, basic_format)
            final_data[index][key] = value || null
        })
    })

    return final_data;
}


basic_format = { "Color Family": null, "Drop": null }
input_data = [ { "Color Family": "BEIGE", "Drop": null }, { "Color Family": "BLACK", "Drop": null }, { "Drop": "DEL 1", "Color Family": null } ]

console.log(fixMapping(basic_format, input_data));

The above code will output

[
  {
    "Color Family": "BEIGE",
    "Drop": "DEL 1"
  },
  {
    "Color Family": "BLACK",
    "Drop": null
  }
]

Update 1: (the need for basic_format variable)

We don't have the same frequency for all the keys, which will lead to inconsistent count of keys in the final object, so we will initiate every object with all the keys we want and null data will be overwritten by the actual value if exist.

So basically, this variable is used to give consistent structure to our final object.

If we didn't use the basic_format, something like this

    if (!final_data[index]) final_data[index] = {}
    final_data[index][key] = value || null

it would yield the output as (notice the missing key Drop in second object)

[ { "Color Family": "BEIGE", "Drop": "DEL 1" }, { "Color Family": "BLACK" } ]