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@ -122,6 +122,6 @@ $ ./outline2 http://gopl.io
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練習 **5.9** :編寫函數 expand,將s中的"foo"替換爲f("foo")的返迴值。
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練習 **5.9** :編寫函數 expand,將s中的"foo"替換爲f("foo")的返迴值。
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```go
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```Go
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func expand(s string, f func(string) string) string
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func expand(s string, f func(string) string) string
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```
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```
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