---
title: "Discussion on \"Chapter 17 : UseCase14 - flatMapMerge\" | Hashnode"
description: "Discussion on \"Chapter 17 : UseCase14 - flatMapMerge\". In UC13 you used flatMapConcat, which processed each stock one after another.\nIn UC14 we use flatMapMerge(). This allows multiple inner flows to run at the same time.Now we upgrade from sequential exp"
url: "https://hashnode.com/posts/chapter-17-usecase14-flatmapmerge/6990c9910f9fa9734c0bfb95"
---

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# [Chapter 17 : UseCase14 - flatMapMerge](https://kotlinflow.hashnode.dev/chapter-17-usecase14-flatmapmerge?utm_source=hashnode&utm_medium=feed)

In UC13 you used flatMapConcat, which processed each stock one after another. In UC14 we use flatMapMerge(). This allows multiple inner flows to run at the same time.Now we upgrade from sequential exp

Jan 31 · 5 min read · kotlinflow.hashnode.dev  
Updated Feb 20  
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## Written by

[Ganesh Rama Hegde](https://hashnode.com/@hegde10122)

@hegde10122 · Mumbai,India

  
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