Ensure that parser.js returns only the needed fields.

src/utils/parser.js

@@ -1,5 +1,8 @@
+// TODO: Create a class from that file.
 export default (data, keyToFind) => {
-  const result = [];
+  let result = [];
+
+  // Keep only levels with { isFruit: true }.
   JSON.stringify(data, (_, nestedValue) => {
     if (nestedValue && nestedValue[keyToFind]) {
       result.push(nestedValue);
@@ -7,9 +10,50 @@ export default (data, keyToFind) => {
     return nestedValue;
   });
 
+  // Check for a Fruit structure.
+  result = result.filter(fruit => {
+    return fruit_structure(fruit, [
+      "color",
+      "description",
+      "expires",
+      "id",
+      "image",
+      "isFruit",
+      "name",
+      "price",
+      "taste"
+    ]);
+  });
+
+  // Sort fruits by id.
   result.sort((a, b) => {
     return a.id - b.id;
   });
 
   return result;
 };
+
+/**
+ * Check for a Fruit structure.
+ *
+ * @param {Object} obj
+ * @param {Array} attrs
+ */
+function fruit_structure(obj, attrs) {
+  // Check if a field is missing.
+  for (let i = 0; i < attrs.length; ++i) {
+    if (!Object.prototype.hasOwnProperty.call(obj, attrs[i])) return false;
+  }
+
+  // Check for additional fields.
+  Object.fromEntries(
+    // eslint-disable-next-line no-unused-vars
+    Object.entries(obj).filter(([key, value]) => {
+      // It mutates the initial object by reference.
+      if (key === "does") delete obj[key];
+      return attrs.includes(key);
+    })
+  );
+
+  return true;
+}