dqrzot2791 2016-06-07 20:13
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Golang:如何从字符串中替换第n个字符

I want to replace nth char from in the original string, I can access nth char from string by using chars[i], but when I assign value to chars[i] it giving error.

package main
import "fmt"

func main() {
  var chars = "abcdef"
  fmt.Println(string(chars[3]))
  chars[3] = "z" // is not working, 
}
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  • doupinge9055 2016-06-07 20:22
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    This is happening because chars is actually a string and is immutable. If you declared it appropriately (as a byte slice) then you can assign to it as you're attempting. Here's an example;

    package main
    import "fmt"
    
    func main() {
      var chars = []byte{'a', 'b', 'c', 'd', 'e', 'f'}
      fmt.Println(string(chars[3]))
      fmt.Printf("%T
    ", chars)
      chars[3] = 'z'
      fmt.Println(string(chars))
    }
    

    https://play.golang.org/p/N1sSsfIBQY

    Alternately you could use reslicing as demonstrated in the other answer.

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