Generator sample solution

week8/exercise/26312_task01.js

@@ -0,0 +1,59 @@
+const express = require('express');
+const app = express();
+
+const PORT = process.env.PORT || 3000;
+
+const events = [
+    { id: 1, name: 'Ev1', capacity: 3, guests: [] },
+    { id: 2, name: 'Ev2', capacity: 50, guests: [] },
+    { id: 3, name: 'Ev3', capacity: 50, guests: [] }
+];
+const spots = {};
+
+app.use(express.urlencoded());
+
+app.post('/event', (req, res) => {
+    const { name, capacity } = req.body;
+    const event = {
+        id: events.length + 1,
+        name,
+        capacity
+    };
+    events.push(event);
+    res.send(event);
+});
+
+app.get('/event/:id', (req, res) => {
+    const id = req.params.id;
+    console.log(id);
+    const event = events.filter((ev) => ev.id === parseInt(id));
+    console.log(event);
+    res.send(event);
+});
+
+app.post('/event/:id/book-spot', (req, res) => {
+    const eventId = req.params.id;
+    if (spots[eventId] == undefined) {
+        spots[eventId] = bookSpot(eventId);
+    }
+    const spot = spots[eventId].next();
+
+    if (spot.done) {
+        res.status(400).end('Event overbooked');
+    } else {
+        const { firstName, lastName } = req.body;
+        (events.find(ev => ev.id == eventId)).guests.push({ firstName, lastName });
+        res.status(201).end('Success');
+    }
+});
+
+function* bookSpot(eventId) {
+    let occupied = 0;
+    const max = events.find(ev => ev.id == eventId).capacity;
+
+    while (occupied < max) {
+        yield ++occupied;
+    }
+}
+
+app.listen(PORT, () => console.log(`Server is listening on PORT ${PORT}...`));