Implement expirable Promise

Author: tshemsedinov

JavaScript/b-expirable.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const PROMISE_TIMEOUT = 1000;
+
+class Expirable extends Promise {
+  constructor(executor) {
+    super((resolve, reject) => {
+      executor(val => {
+        if (this.expired) {
+          reject(new Error('Expired'));
+          return;
+        }
+        clearTimeout(this.timer);
+        resolve(val);
+      }, reject);
+    });
+    this.expired = false;
+    this.timer = setTimeout(() => {
+      this.expired = true;
+    }, PROMISE_TIMEOUT);
+  }
+}
+
+// Usage
+
+new Expirable(resolve => {
+  setTimeout(resolve, 100);
+}).then(data => {
+  console.dir({ data });
+}).catch(error => {
+  console.dir({ error });
+});
+
+new Expirable(resolve => {
+  setTimeout(resolve, 2000);
+}).then(data => {
+  console.dir({ data });
+}).catch(error => {
+  console.dir({ error });
+});