This code defines a JavaScript function `dataFromRow` that extracts and...

This code defines a JavaScript function dataFromRow that extracts and converts data from a table row (row) into an object, using a set of predefined headers as keys.

Here is a detailed explanation of what this code does:

1. Function Definition:

   • The function dataFromRow takes two arguments:
     • row: A table row (<tr>) element, typically representing a single row from an HTML table.
     • headers: An array of strings, where each string is a header corresponding to the table columns.

2. Fetching all <td> elements in the row:

   • The code uses row.querySelectorAll('td') to select all <td> (table cell) elements in the row.

3. Mapping to Key-Value Pairs:

   • The [...row.querySelectorAll('td')] converts the NodeList of <td> elements into an array so that it can be processed with .map.
   • The .map() method is used to map each <td> element and its index to a [key, value] pair:
     • headers[index]: Retrieves the header at the same index as the column index of the <td> element, which acts as the "key."
     • td.textContent: Extracts the text content of the <td> element, which acts as the "value."

4. Converting to an Object:

   • Object.fromEntries() takes the array of [key, value] pairs returned by .map() and converts it into an object.

5. Return Value:

   • The final object maps header names (from the headers array) to their corresponding cell values (from the td elements in the row).

Example Usage:

Suppose the HTML table row looks like this:

<tr>
  <td>John</td>
  <td>Doe</td>
  <td>25</td>
</tr>

And the corresponding headers array is:

const headers = ['firstName', 'lastName', 'age'];

Calling the function:

const row = document.querySelector('tr');
const data = dataFromRow(row, headers);
console.log(data);

The output would be:

{
  firstName: 'John',
  lastName: 'Doe',
  age: '25'
}

In summary, this code takes an HTML table row and converts it into an object where column headers act as keys and the cell contents act as values.