dongxieyi9115
2015-03-23 03:29
浏览 85
已采纳

为Unicode字母编写toUpper函数

From here http://blog.golang.org/slices (it's right before the Capacity section)

type path []byte

func (p path) ToUpper() {
    for i, b := range p {
        if 'a' <= b && b <= 'z' {
            p[i] = b + 'A' - 'a'
        }
    }
}

func main() {
    pathName := path("/usr/bin/tso")
    pathName.ToUpper()
    string1 := string(pathName)
    fmt.Printf("%s
", string1)
}

Was reading on slices and stuff in golang. This is a function to convert ascii characters. How would you go about turning this function to handle unicode as well?

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2条回答 默认 最新

  • drydaenth257216154 2015-03-23 03:35
    已采纳

    You should use rune when you use unicode. The unicode package in golang has a toUpper function.

    package main
    
    import (
        "unicode"
        "fmt"
    )
    
    type path []rune
    
    func (p path) ToUpper() {
        for i, b := range p {
            p[i] = unicode.ToUpper(b)
        }
    }
    
    func main() {
        pathName := path("/usr/bin/tso")
        pathName.ToUpper()
        string1 := string(pathName)
        fmt.Printf("%s
    ", string1)
    }
    

    in the playground: example

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  • dongyudun6465 2015-03-23 04:11

    You can use strings.Map to apply a function to each rune of a string, returning the mapped string. Playground link to this code:

    package main
    
    import (
        "fmt"
        "strings"
        "unicode"
    )
    
    func main() {
        pathName := strings.Map(unicode.ToUpper, "/usr/bin/tso")
        fmt.Printf("%s
    ", pathName)
    }
    
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