如何获得字符串中的行数？

How do I find out how many lines are in a string in Go?

Is there a builtin function, or do I have to "manually" search the string for all newlines +1?

For example,

package main

import (
    "fmt"
    "strings"
)

func NumLines(s string) int {
    n := strings.Count(s, "
")
    if !strings.HasSuffix(s, "
") {
        n++
    }
    return n
}

func main() {
    s := "line 1
line 2
line 3"
    fmt.Println(NumLines(s))
}

Output:

3