英文:
cut off last rune in UTF string
问题
如何截取UTF字符串中的最后一个符文？
这种方法显然是不正确的：
package mainimport ("fmt""unicode/utf8")func main() {string := "你好"length := utf8.RuneCountInString(string)// 如何截取UTF字符串中的最后一个符文？// 这种方法显然是不正确的：withoutLastRune := string[0:length-1]fmt.Println(withoutLastRune)}
英文:
How to cut off last rune in UTF string?
This method is obviously incorrect:
package mainimport ("fmt""unicode/utf8")func main() {string := "你好"length := utf8.RuneCountInString(string)// how to cut off last rune in UTF string?// this method is obviously incorrect:withoutLastRune := string[0:length-1]fmt.Println(withoutLastRune)}
答案1
得分: 4
几乎完成了，
utf8包中有一个函数可以解码字符串中的最后一个符文，并返回其长度。只需将该长度的字节数从字符串末尾截取掉即可：
str := "你好"_, lastSize := utf8.DecodeLastRuneInString(str)withoutLastRune := str[:len(str)-lastSize]fmt.Println(withoutLastRune)
英文:
Almost,
utf8 package has a function to decode the last rune in a string which also returns its length. Cut that number of bytes off the end and you are golden:
str := "你好"_, lastSize := utf8.DecodeLastRuneInString(str)withoutLastRune := str[:len(str)-lastSize]fmt.Println(withoutLastRune)
答案2
得分: 0
使用DecodeLastRuneInString是最好的答案。我只想指出，如果你更看重简洁的代码而不是运行时效率，你可以这样做：
s := []rune(str)fmt.Println(string(s[:len(s)-1]))
英文:
Using DecodeLastRuneInString is the best answer. I'll just note that if you prize simpler code over run time efficiency, you can do
<pre>
s := []rune(str)
fmt.Println(string(s[:len(s)-1]))
</pre>
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