i think i got it

Author: mjm-git185

debugging/book-library/script.js

@@ -49,11 +49,11 @@ function render() {
   const table = document.getElementById("display");
   const rowsNumber = table.rows.length;
   //delete old table
-
- for (let n = rowsNumber - 1;  n > 0; n--) {
-  table.deleteRow(n); 
+while (table.rows.length > 1) {
+  table.deleteRow(1); 
   }
 
+
   //insert updated row and cells
   const length = myLibrary.length;
   for (let i = 0; i <= length; i++) {