about_common_interfaces.go

package go_koans

import "bytes"

func aboutCommonInterfaces() {
  {
    in := new(bytes.Buffer)
    in.WriteString("hello world")

    out := new(bytes.Buffer)
	out.ReadFrom(in)

    /*
       Your code goes here.
       Hint, use these resources:

       $ godoc -http=:8080
       $ open http://localhost:8080/pkg/io/
       $ open http://localhost:8080/pkg/bytes/
    */

    assert(out.String() == "hello world") // get data from the io.Reader to the io.Writer
  }

  {
    in := new(bytes.Buffer)
    in.WriteString("hello world")

    out := new(bytes.Buffer)
	x,_ := in.ReadBytes('o')
	out.Write(x)
		
    assert(out.String() == "hello") // duplicate only a portion of the io.Reader
  }
}