async scheduler 1

solutions/test-async-scheduler.js

@@ -0,0 +1,31 @@
+const TaskScheduler = require('./async-scheduler');
+
+function wait(ms, label, shouldReject = false) {
+  return () => new Promise((resolve, reject) => {
+    console.log(`${label} started`);
+    setTimeout(() => {
+      console.log(`${label} finished`);
+      shouldReject ? reject(new Error(label + ' failed')) : resolve(label + ' ok');
+    }, ms);
+  });
+}
+
+(async () => {
+  const scheduler = new TaskScheduler(2);
+
+  // By default paused; add tasks
+  const p1 = scheduler.addTask(wait(300, 't1'));
+  const p2 = scheduler.addTask(wait(200, 't2'));
+  const p3 = scheduler.addTask(wait(100, 't3'));
+  const p4 = scheduler.addTask(wait(50, 't4'));
+
+  console.log('Playing...');
+  scheduler.play();
+
+  try {
+    const results = await Promise.all([p1, p2, p3, p4]);
+    console.log('All results:', results);
+  } catch (err) {
+    console.error('One failed:', err.message);
+  }
+})();