英文:
Indexing string as chars
问题
字符串的元素具有字节类型，并且可以使用常规的索引操作进行访问。
如何将字符串的元素作为字符获取？
“some”1 -> “o”
英文:
> The elements of strings have type byte and may be accessed using the
> usual indexing operations.
How can I get element of string as char ?
> "some"1 -> "o"
答案1
得分: 10
最简单的解决方案是将其转换为一个符文数组：
var runes = []rune("someString")
请注意，当您在字符串上进行迭代时，您不需要进行转换。请参考Effective Go中的示例：
for pos, char := range "日本語" {
fmt.Printf("character %c starts at byte position %d\n", char, pos)
}
这将打印出：
character 日 starts at byte position 0
character 本 starts at byte position 3
character 語 starts at byte position 6
英文:
The simplest solution is to convert it to an array of runes :
var runes = []rune("someString")
Note that when you iterate on a string, you don't need the conversion. See this example from Effective Go :
for pos, char := range "日本語" {
fmt.Printf("character %c starts at byte position %d\n", char, pos)
}
This prints
character 日 starts at byte position 0
character 本 starts at byte position 3
character 語 starts at byte position 6
答案2
得分: 4
Go字符串通常是UTF-8编码的，但不一定是。如果它们是Unicode字符串，那么术语“字符”相当复杂，并且没有通用/唯一的符文（码点）和Unicode字符的双射。
无论如何，可以很容易地在切片中使用码点（符文）并使用索引进行操作，使用以下转换：
package main
import "fmt"
func main() {
utf8 := "Hello, 世界"
runes := []rune(utf8)
fmt.Printf("utf8:% 02x\nrunes: %#v\n", []byte(utf8), runes)
}
还可以在这里查看：http://play.golang.org/p/qWVSA-n93o
注意：通常通过索引访问Unicode“字符”是一个设计错误。大多数文本数据是按顺序处理的。
英文:
Go strings are usually, but not necessarily, UTF-8 encoded. In the case they are Unicode strings, the term "char[acter]" is pretty complex and there is no generall/unique bijection of runes (code points) and Unicode characters.
Anyway one can easily work with code points (runes) in a slice and use indexes into it using a conversion:
package main
import "fmt"
func main() {
utf8 := "Hello, 世界"
runes := []rune(utf8)
fmt.Printf("utf8:% 02x\nrunes: %#v\n", []byte(utf8), runes)
}
Also here: http://play.golang.org/p/qWVSA-n93o
Note: Often the desire to access Unicode "characters" by index is a design mistake. Most of textual data is processed sequentially.
答案3
得分: 0
另一个选项是utf8string包：
package main
import "golang.org/x/exp/utf8string"
func main() {
s := utf8string.NewString("👁️👾👽👼")
t := s.At(2)
println(t == '👽')
}
https://pkg.go.dev/golang.org/x/exp/utf8string
英文:
Another option is the package utf8string:
package main
import "golang.org/x/exp/utf8string"
func main() {
s := utf8string.NewString("🧡💛💚💙💜")
t := s.At(2)
println(t == '💚')
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论