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update ioutil.Discard as Go 1.16 #85

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update ioutil.Discard as Go 1.16 #85

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6 changes: 3 additions & 3 deletions chapter01/01.2.md
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Expand Up @@ -109,11 +109,11 @@ ReadFile 源码中先获取了文件的大小，当大小 < 1e9 时，才会用
```
## Discard 变量 ##

Discard 对应的类型（`type devNull int`）实现了 io.Writer 接口，同时，为了优化 io.Copy 到 Discard，避免不必要的工作，实现了 io.ReaderFrom 接口。
ioutil.Discard 对应的类型io.Discard（原始类型: `type discard struct{}`）实现了 io.Writer 接口，同时，为了优化 io.Copy 到 Discard，避免不必要的工作，实现了 io.ReaderFrom 接口。

devNull 在实现 io.Writer 接口时，只是简单的返回（标准库文件：[src/pkg/io/ioutil.go](http://docscn.studygolang.com/pkg/io/ioutil/#pkg-variables))。
discard 在实现 io.Writer 接口时，只是简单的返回（标准库文件：[src/pkg/io/ioutil.go](http://docscn.studygolang.com/pkg/io/ioutil/#pkg-variables))。
```go
func (devNull) Write(p []byte) (int, error) {
func (discard) Write(p []byte) (int, error) {
return len(p), nil
}
```
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