02_lesson: Added prettier config file

02_lesson_starter/.prettierrc.json

@@ -0,0 +1,7 @@
+{
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "tabWidth": 2,
+  "semi": true,
+  "printWidth": 80
+}

02_lesson_starter/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
         "@reduxjs/toolkit": "^1.8.0",
+        "date-fns": "^2.29.3",
         "prettier": "^2.8.4",
         "react": "^17.0.2",
         "react-dom": "^17.0.2",
@@ -5656,6 +5657,18 @@
         "node": ">=10"
       }
     },
+    "node_modules/date-fns": {
+      "version": "2.29.3",
+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-2.29.3.tgz",
+      "integrity": "sha512-dDCnyH2WnnKusqvZZ6+jA1O51Ibt8ZMRNkDZdyAyK4YfbDwa/cEmuztzG5pk6hqlp9aSBPYcjOlktquahGwGeA==",
+      "engines": {
+        "node": ">=0.11"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/date-fns"
+      }
+    },
     "node_modules/debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -19905,6 +19918,11 @@
         "whatwg-url": "^8.0.0"
       }
     },
+    "date-fns": {
+      "version": "2.29.3",
+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-2.29.3.tgz",
+      "integrity": "sha512-dDCnyH2WnnKusqvZZ6+jA1O51Ibt8ZMRNkDZdyAyK4YfbDwa/cEmuztzG5pk6hqlp9aSBPYcjOlktquahGwGeA=="
+    },
     "debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",

02_lesson_starter/package.json

@@ -4,6 +4,7 @@
   "private": true,
   "dependencies": {
     "@reduxjs/toolkit": "^1.8.0",
+    "date-fns": "^2.29.3",
     "prettier": "^2.8.4",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",

02_lesson_starter/src/features/posts/PostsList.js

@@ -1,17 +1,25 @@
-import { useSelector } from "react-redux";
+import { useSelector } from 'react-redux';
-import { selectAllPosts } from "./postsSlice";
+import { selectAllPosts } from './postsSlice';
-import PostAuthor from "./PostAuthor";
+import PostAuthor from './PostAuthor';
+import TimeAgo from './TimeAgo';
+import ReactionButtons from './ReactionButton';
 
 const PostsList = () => {
   const posts = useSelector(selectAllPosts);
 
-  const renderedPosts = posts.map((post) => (
+  const orderedPosts = posts
+    .slice()
+    .sort((a, b) => b.date.localeCompare(a.date));
+
+  const renderedPosts = orderedPosts.map((post) => (
     <article key={post.id}>
       <h3>{post.title}</h3>
       <p>{post.content.substring(0, 100)}</p>
       <p className="postCredit">
         <PostAuthor userId={post.userId} />
+        <TimeAgo timestamp={post.date} />
       </p>
+      <ReactionButtons post={post} />
     </article>
   ));
 

02_lesson_starter/src/features/posts/ReactionButton.js

@@ -0,0 +1,32 @@
+import { useDispatch } from 'react-redux';
+import { reactionAdded } from './postsSlice';
+
+const reactionEmoji = {
+  thumbsUp: '👍',
+  wow: '😮',
+  heart: '❤️',
+  rocket: '🚀',
+  coffee: '☕',
+};
+
+const ReactionButtons = ({ post }) => {
+  const dispatch = useDispatch();
+  const reactionButtons = Object.entries(reactionEmoji).map(([name, emoji]) => {
+    return (
+      <button
+        key={name}
+        type="button"
+        className="reactionButton"
+        onClick={() =>
+          dispatch(reactionAdded({ postId: post.id, reaction: name }))
+        }
+      >
+        {emoji} {post.reactions[name]}
+      </button>
+    );
+  });
+
+  return <div>{reactionButtons}</div>;
+};
+
+export default ReactionButtons;

02_lesson_starter/src/features/posts/TimeAgo.js

@@ -0,0 +1,18 @@
+import { parseISO, formatDistanceToNow } from "date-fns";
+
+const TimeAgo = ({ timestamp }) => {
+  let timeAgo = "";
+  if (timestamp) {
+    const date = parseISO(timestamp);
+    const timePeriod = formatDistanceToNow(date);
+    timeAgo = `${timePeriod} ago`;
+  }
+
+  return (
+    <span title={timestamp}>
+      &nbsp; <i>{timeAgo}</i>
+    </span>
+  );
+};
+
+export default TimeAgo;

02_lesson_starter/src/features/posts/postsSlice.js

@@ -1,15 +1,32 @@
 import { createSlice, nanoid } from "@reduxjs/toolkit";
+import { sub } from "date-fns";
 
 const initialState = [
   {
     id: "1",
     title: "Learning Redux Toolkit",
     content: "I've heard good things.",
+    date: sub(new Date(), { minutes: 10 }).toISOString(),
+    reactions: {
+      thumbsUp: 0,
+      wow: 0,
+      heart: 0,
+      rocket: 0,
+      coffee: 0,
+    },
   },
   {
     id: "2",
     title: "Slice...",
     content: "The more I say slice, the more I want pizza.",
+    date: sub(new Date(), { minutes: 5 }).toISOString(),
+    reactions: {
+      thumbsUp: 0,
+      wow: 0,
+      heart: 0,
+      rocket: 0,
+      coffee: 0,
+    },
   },
 ];
 
@@ -29,15 +46,30 @@ const postsSlice = createSlice({
             title,
             content,
             userId,
+            date: new Date().toISOString(),
+            reactions: {
+              thumbsUp: 0,
+              wow: 0,
+              heart: 0,
+              rocket: 0,
+              coffee: 0,
+            },
           },
         };
       },
     },
+    reactionAdded(state, action) {
+      const { postId, reaction } = action.payload;
+      const existingPost = state.find((post) => post.id === postId);
+      if (existingPost) {
+        existingPost.reactions[reaction]++; // this kind of immer action can only happen in slice
+      }
+    },
   },
 });
 
 export const selectAllPosts = (state) => state.posts;
 
-export const { postAdded } = postsSlice.actions;
+export const { postAdded, reactionAdded } = postsSlice.actions;
 
 export default postsSlice.reducer;