pohuan commented on code in PR #41965:
URL: https://github.com/apache/arrow/pull/41965#discussion_r1635239141


##########
js/src/ipc/writer.ts:
##########
@@ -294,9 +294,9 @@ export class RecordBatchWriter<T extends TypeMap = any> 
extends ReadableInterop<
             if (!prevDictionary || prevDictionary.data[0] !== chunks[0]) {
                 // * If `index > 0`, then `isDelta` is true.
                 // * If `index = 0`, then `isDelta` is false, because this is 
either the initial or a replacement DictionaryMessage.
-                chunks.forEach((chunk, index) => 
this._writeDictionaryBatch(chunk, id, index > 0));
+                for (const [index, chunk] of chunks.entries()) 
this._writeDictionaryBatch(chunk, id, index > 0);

Review Comment:
   So, is there any change left to commit? Would it be merged recently? Thanks 
for the help.



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