add 'childrens' as a field on books

frontend/files/app.js

@@ -10,9 +10,17 @@ function init() {
       // prepare response
       books.forEach(apiResponseParsing);
       document.getElementById("search").addEventListener("input", (e) => {
-        renderTable(search(books, e.target.value));
+        renderTable(
+          search(
+            books,
+            e.target.value,
+            document.getElementById("childrens").checked
+          )
+        );
       });
-      renderTable(books);
+      renderTable(
+        search(books, "", document.getElementById("childrens").checked)
+      );
     });
 }
 
@@ -81,12 +89,12 @@ function apiResponseParsing(book) {
   return book;
 }
 
-function search(books, searchBy) {
+function search(books, searchBy, includeChildrensBooks) {
   searchBy = searchCleaner(searchBy);
   if (searchBy !== "") {
     books = books.filter(
-      ({ title, authors, genre, publisher, series, year }) => {
-        return Object.values({
+      ({ title, authors, genre, publisher, series, year, childrens }) => {
+        var inSearch = Object.values({
           title,
           authors: authors.join(" "),
           genre,
@@ -94,6 +102,10 @@ function search(books, searchBy) {
           series,
           year,
         }).find((field) => searchCleaner(field).indexOf(searchBy) !== -1);
+        if (!includeChildrensBooks) {
+          return inSearch && !childrens;
+        }
+        return inSearch;
       }
     );
   }