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Update ch4-03.md

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Fix typo of `hasEdge`
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suntong 2022-03-25 14:48:12 -04:00 committed by GitHub
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@ -284,7 +284,7 @@ func hasEdge(from, to string) bool {
}
```
其中addEdge函数惰性初始化map是一个惯用方式，也就是说在每个值首次作为key时才初始化。addEdge函数显示了如何让map的零值也能正常工作；即使from到to的边不存在，graph[from][to]依然可以返回一个有意义的结果。
其中addEdge函数惰性初始化map是一个惯用方式，也就是说在每个值首次作为key时才初始化。hasEdge函数显示了如何让map的零值也能正常工作；即使from到to的边不存在，graph[from][to]依然可以返回一个有意义的结果。
**练习 4.8：** 修改charcount程序，使用unicode.IsLetter等相关的函数，统计字母、数字等Unicode中不同的字符类别。