Add TargetIterator

tshemsedinov · tshemsedinov · commit 7e71367facf3 · 2024-07-15T03:52:52.000+03:00
diff --git a/JavaScript/b-target-iterator.js b/JavaScript/b-target-iterator.js
@@ -0,0 +1,45 @@
+'use strict';
+
+class TargetIterator {
+  #target = null;
+
+  constructor(target) {
+    this.#target = target;
+  }
+
+  [Symbol.asyncIterator]() {
+    const next = () => new Promise((resolve) => {
+      const listener = (event) => {
+        this.#target.removeEventListener('step', listener);
+        resolve({
+          value: event.detail,
+          done: false,
+        });
+      };
+      this.#target.addEventListener('step', listener);
+    });
+    const iterator = { next };
+    return iterator;
+  }
+}
+
+// Usage
+
+const main = async () => {
+  const target = new EventTarget();
+  const iterator = new TargetIterator(target);
+
+  let counter = 0;
+  setInterval(() => {
+    counter++;
+    const data = { detail: { counter } };
+    const event = new CustomEvent('step', data);
+    target.dispatchEvent(event);
+  }, 1000);
+
+  for await (const step of iterator) {
+    console.log(step);
+  }
+};
+
+main();
