从JSON对象中删除所有键

Question

Initially I was working with a CSV, where each row contained data eg

------------------------------------------------------
123            |   cat               |   dog         |   
------------------------------------------------------
456            |   cat               |   rabbit      |   
------------------------------------------------------
789            |   snake             |   dog         |   
------------------------------------------------------

I am now getting more data with different structure, so I can no longer use a csv. Instead I am using JSON file. The JSON file looks something like this

[
  [
    {
      "ID": 123,
      "animal_one": "cat",
      "animal_two": "dog"
    },
    {
      "ID": 456,
      "animal_one": "cat",
      "animal_two": "rabbit"
    },
    {
      "ID": 789,
      "animal_one": "snake",
      "animal_two": "dog"
    }
  ],
  [
    2222
  ],
  [
    12345
  ],
  [
    "2012-01-02"
  ],
  [
    "2012-12-20"
  ]
]

So you can see the additional data. For this part of the application, I only want to work with the first part of the JSON, the part containing animals. The function I have basically works on values only, so I need to make this JSON like the original CSV file, whereby I only have the values, no keys.

So I am loading the JSON file, which is then contained within the variable data

I am then trying something like this

var key = "CUST_ID";
delete data[0][key];
console.log(JSON.stringify(data[0]))

Although this doesnt even work, I think it is the wrong approach anyway. I dont want to define the keys I want removed, I just want it to remove all keys, and keep the values.

How would I go about doing this? I am using data[0] to get the first section of the JSON, the part that contains animals. Not sure if this is correct either?

Thanks

Answer 1

I dont want to define the keys I want removed

You still will need to define which keys you want the values from. One could just take all the values from the object, in arbitrary order, but that's not robust against changes to the data format. Use something like

const table = data[0].map(value => [value.ID, value.animal_one, value.animal_two]);

Answer 2

You can simply do this, if you dont care what keys you are getting:

var collection = "";
data[0].forEach(function(row) {
    var line = [];
    Object.keys(row).forEach(function(key) {
        line.push(row[key])
    });
    collection = collection + line.join(',') + '\n';
})

You will get csv string out of collection

Answer 3

data[0].forEach(function(row,index) {
   data[0][index] = Object.values(data[0][index]);
});