Implement sequence

src/sequence/zip.ts

@@ -1,9 +1,11 @@
 export function* zip<T, B>(value: Iterable<T>, items: Iterable<B>): Iterable<[T, B]> {
     const iteratorA = value[Symbol.iterator]();
     const iteratorB = items[Symbol.iterator]();
-    let {value: itA, done: doneA} = iteratorA.next();
-    let {value: itB, done: doneB} = iteratorB.next();
-    while (!doneA && !doneB) {
-        yield [itA, itB];
+    let a = iteratorA.next();
+    let b = iteratorB.next();
+    while (!a.done && !b.done) {
+        yield [a.value, b.value];
+        a = iteratorA.next();
+        b = iteratorB.next();
     }
 }