zipWithIndexL 비동기 동작 지원 추가

Lazy/zipWithIndexL.js

@@ -1,6 +1,10 @@
+import go1 from "../Strict/go1.js";
 import toIter from "../Strict/toIter.js";
 
 export default function* zipWithIndexL(iter) {
   let i = -1;
-  for (const a of toIter(iter)) yield [++i, a];
+  for (const a of toIter(iter)) {
+    const _i = ++i;
+    yield go1(a, (a) => [_i, a]);
+  }
 }

test/spec.js

@@ -2750,4 +2750,26 @@ const { expect } = chai;
       expect(await last([1, 2, Promise.resolve(3)])).to.eql(3);
     });
   });
+
+  describe(`L.zipWIthIndex`, function () {
+    it(`Yield each element with index`, function () {
+      // given
+      const items = ["a", "b", "c", "d", "e"];
+
+      // when
+      const result = L.zipWithIndex(items);
+
+      // then
+      let cur;
+      for (let i = 0; i < items.length; i++) {
+        const item = items[i];
+        cur = result.next();
+        expect(cur.done).false;
+        expect(i).to.equal(cur.value[0]);
+        expect(item).to.equal(cur.value[1]);
+      }
+      cur = result.next();
+      expect(cur.done).true;
+    });
+  });
 })();