refactor

src/sync/impl.ts

@@ -7,7 +7,7 @@ import { createQueue } from "../queue.js";
 import { getRandomElement } from "../random/index.js";
 import { RandomOptions } from "../random/types.js";
 import { Converter, FilterPredicate, Equater, BiConverter, Predicate, Accumulator, Comparer, Action } from "../types.js";
-import { strictEquals, identity, operatorCompare, reverseComparer, wrapAsIterable, defaultArrayComparer, combineComparers } from "../utils.js";
+import { strictEquals, identity, operatorCompare, reverseComparer, asIterable, defaultArrayComparer, combineComparers } from "../utils.js";
 import { array, empty } from "./index.js";
 import { Sequence, GroupedSequence, OrderedSequence } from "./types.js";
 
@@ -1645,7 +1645,7 @@ class SkipWhileSequence<T> extends BaseSequence<T> {
   }
 
   override *iterator() {
-    const e = wrapAsIterable(this.#sequence.iterator());
+    const e = asIterable(this.#sequence.iterator());
 
     for (const obj of e) {
       if (!this.#predicate(obj)) {
@@ -1695,7 +1695,7 @@ class SkipLastSequence<T> extends BaseSequence<T> {
 
     i = 0;
 
-    for (const obj of wrapAsIterable(iterator)) {
+    for (const obj of asIterable(iterator)) {
       yield buffer[i];
       buffer[i] = obj;
       i = (i + 1) % this.#n;
@@ -1735,7 +1735,7 @@ class SkipSequence<T> extends BaseSequence<T> {
       i++;
     } while (i < this.#n);
 
-    yield* wrapAsIterable(iterator);
+    yield* asIterable(iterator);
   }
 }
 
@@ -1930,7 +1930,7 @@ class PeekSequence<T> extends DelegatedSequence<T> {
   }
 
   override *iterator() {
-    for (const obj of wrapAsIterable(super.iterator())) {
+    for (const obj of this.sequence) {
       this.#action(obj);
       yield obj;
     }
@@ -2230,13 +2230,15 @@ class GroupBySequence<TElement, TKey, TResult> extends BaseSequence<GroupedSeque
 
     for (const obj of this.#sequence) {
       const key = this.#keySelector(obj);
-      let grouping = groupings.get(key);
+      const value = this.#elementSelector(obj);
 
-      if (!grouping) {
-        groupings.set(key, grouping = []);
+      const grouping = groupings.get(key);
+
+      if (grouping) {
+        grouping.push(value);
+      } else {
+        groupings.set(key, [value]);
       }
-
-      grouping.push(this.#elementSelector(obj));
     }
 
     for (const entry of groupings) {