http://tour.golang.org/methods/11的解决方案

Question

Exercise: Readers

Implement a Reader type that emits an infinite stream of the ASCII character 'A'.

I don't understand the question, how to emit character 'A'? into which variable should I set that character?

Here's what I tried:

package main
import "code.google.com/p/go-tour/reader"
type MyReader struct{}
// TODO: Add a Read([]byte) (int, error) method to MyReader.
func (m MyReader) Read(b []byte) (i int, e error) {
    b = append(b,'A') // this is wrong..
    return 1, nil // this is also wrong..
}
func main() {
    reader.Validate(MyReader{}) // what did this function expect?
}

Answer 1

Ah I understand XD

I think it would be better to say: "rewrite all values in []byte into 'A's"

package main

import "code.google.com/p/go-tour/reader"

type MyReader struct{}

// TODO: Add a Read([]byte) (int, error) method to MyReader.
func (m MyReader) Read(b []byte) (i int, e error) {
    for x := range b {
        b[x] = 'A'
    }
    return len(b), nil
}

func main() {
    reader.Validate(MyReader{})
}