how to delete a column in a df in javascript

To delete a column of a dataframe (let's say df) in javascript, you can first convert the dataframe into an array of arrays using the map method of the dataframe. Then, you can iterate over each row of the array and remove the element from the corresponding index using the splice method.

Here is the code that shows how to delete a column of a dataframe in javascript:

// create the dataframe
const df = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];

// define the index of the column to delete
const indexToDelete = 1;

// convert the dataframe to an array of arrays
const arr = df.map((row) => [...row]);

// delete the column
for (let i = 0; i < arr.length; i++) {
  arr[i].splice(indexToDelete, 1);
}

console.log(arr);
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This will output the modified array of arrays without the column at the specified index. Note that this method modifies the original array, so make a copy of the dataframe if you want to preserve the original.