Flatten function/operation in functional programming

Flatten function/operation is what you want to apply to source code tree written in Java, like this:

├── hadoop-client-integration-tests
│   ├── pom.xml
│   └── src
│       └── test
│           ├── java
│           │   └── org
│           │       └── apache
│           │           └── hadoop
│           │               └── example
│           │                   ├── ITUseHadoopCodecs.java
│           │                   └── ITUseMiniCluster.java
│           └── resources
│               ├── hdfs-site.xml
│               └── log4j.properties

(the post first published at 20251208.)


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