#3 test commit

js/main.js

+const test = {
+    from: 0,
+    to: 10,
+    [Symbol.iterator]: () => {
+        return {
+            current: test.from,
+            last: test.to,
+            next() {
+                if(this.current <= this.last) {
+                    return {done: false, value: this.current++};
+                } else {
+                    return {done: true};
+                }
+            }
+        }
+     
+    }
+}
+for(const t of test){
+    console.log(t);
+}
+
+const arr = [0,1,20,34];
+const it = arr[Symbol.iterator]();
+
+console.log(it.next());
+console.log(it.next());
+console.log(it.next());
+
+function* tracker(){
+    const start = Date.now();
+    while(true){
+        const y = yield Date.now() - start;
+        console.log({y});
+        yield y;
+    }
+}
+
+const tr1 = tracker();
+const tr2 = tracker();
+console.log(tr1.next(1).value);
+console.log(tr2.next().value);
+console.log(tr1.next(33).value);
+setTimeout(()=>{
+    console.log(tr1.next(3).value);
+    console.log(tr2.next(6).value);
+    console.log(tr1.next(3).value);
+},2000)
\ No newline at end of file