Take read status in consideration when sorting

src/newsreader/js/pages/homepage/components/postlist/filters.js

@@ -4,6 +4,19 @@ const isEmpty = (object = {}) => {
   return Object.keys(object).length === 0;
 };
 
+const sortOrdering = (firstPost, secondPost) => {
+  const dateOrdering =
+    new Date(firstPost.publicationDate) < new Date(secondPost.publicationDate);
+
+  if (firstPost.read && !secondPost.read) {
+    return 1;
+  } else if (secondPost.read && !firstPost.read) {
+    return -1;
+  }
+
+  return dateOrdering;
+};
+
 export const filterPostsByRule = (rule = {}, posts = []) => {
   const filteredPosts = posts.filter(post => {
     return post.rule === rule.id;
@@ -11,9 +24,7 @@ export const filterPostsByRule = (rule = {}, posts = []) => {
 
   const filteredData = filteredPosts.map(post => ({ ...post, rule: { ...rule } }));
 
-  return filteredData.sort((firstPost, secondPost) => {
-    return new Date(secondPost.publicationDate) - new Date(firstPost.publicationDate);
-  });
+  return filteredData.sort(sortOrdering);
 };
 
 export const filterPostsByCategory = (category = {}, rules = [], posts = []) => {
@@ -29,9 +40,7 @@ export const filterPostsByCategory = (category = {}, rules = [], posts = []) =>
     return filteredPosts.map(post => ({ ...post, rule: { ...rule } }));
   });
 
-  const sortedPosts = [...filteredData.flat()].sort((firstPost, secondPost) => {
-    return new Date(secondPost.publicationDate) - new Date(firstPost.publicationDate);
-  });
+  const sortedPosts = [...filteredData.flat()].sort(sortOrdering);
 
   return sortedPosts;
 };