feat(validate): require author and enforce pages as positive integer"

Author: rarityXtreme

debugging/book-library/script.js

@@ -25,22 +25,35 @@ const author = document.getElementById("author");
 const pages = document.getElementById("pages");
 const check = document.getElementById("check");
 
-//check the right input from forms and if its ok -> add the new book (object in array)
-//via Book function and start render function
+
 function submit() {
+ 
   if (
-    title.value == null ||
-    title.value == "" ||
-    pages.value == null ||
-    pages.value == ""
+    !title.value?.trim() ||
+    !author.value?.trim() ||
+    !pages.value?.trim()
   ) {
     alert("Please fill all fields!");
     return false;
-  } else {
-    let book = new Book(title.value, author.value, pages.value, check.checked);
-  myLibrary.push(book);
-    render();
   }
+
+  const pagesNum = Number(pages.value);
+  if (!Number.isInteger(pagesNum) || pagesNum < 1) {
+    alert("Pages must be a positive whole number.");
+    return false;
+  }
+
+  // create and add the book
+  const book = new Book(
+    title.value.trim(),
+    author.value.trim(),
+    pagesNum,
+    check.checked
+  );
+  myLibrary.push(book);
+  render();
+  return true;
+}
 }
 
 function Book(title, author, pages, check) {