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

Question

练习:读者

实现一个发出ASCII字符"A"的无限流的Reader类型.

我不明白这个问题,如何发出字符'A'？我应该在哪个变量中设置该字符？

这是我试过的:

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

啊,我理解XD

我认为最好说:"将所有值重写[]byte为'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{})
}