Perry wang900115

## io.md

      
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                wang900115
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              October 9, 2025 15:53
            
              
                Golang system programming part
              
          
    type Reader interface {
  Read(p []byte) (n int, err error)
}


Concept: caller give me empty bowl (p), then i give into p.
Reader: "Produce data"
Read: "Pour my data into empty bowl"

type Writer interface{