3.2

Author: odoldotol

03-callbacks-and-events/ticker.fix.mjs

@@ -0,0 +1,38 @@
+import { EventEmitter } from 'events';
+
+/**
+ * @param {number} number 
+ * @param {(n:number)=>any} callback 
+ */
+function ticker(
+  number,
+  callback
+) {
+  const emitter = new EventEmitter();
+  let tick_count = 0;
+
+  let ticker50 = () => {
+    setTimeout(() => {
+      if (ticker50 !== null) {
+        emitter.emit('tick');
+        tick_count++;
+        ticker50();
+      }
+    }, 50);
+  };
+
+  setTimeout(() => {
+    ticker50 = null;
+    callback(tick_count);
+  }, number);
+
+  ticker50();
+
+  return emitter;
+};
+
+const runningTicker = ticker(1000, (tick_count) => {
+  console.log(tick_count);
+});
+
+runningTicker.on('tick', () => console.log('tick'));