How to get the number of rows and put them in the column on the left by numbering them?

Question

JavaScript

There is a code example (column on the right) how to count the number of lines and number them in the column on the left, displaying the line numbering (1,2,3,4,5 ...)

And the problem with repeating the code for other blocks (
https:// jsfiddle.net/sp_true/f9dg63r2/1/

Answer 1

const rowsCount = content.split('\n').length;
It remains to display the line numbers in the loop.

rowNumbers.innerHTML = Array(rowsCount).fill(0).map((_,i)=>`<span>${i+1}</span>`).join('<br>');