I want to use upCase as a variable in expend, But it said "Cannot use 'upCase(s1)'(type string) as type func(string) string. how can I to convert upCase type? Or what do I need do to make the wrong disappear?
package main
import (
"fmt"
"strings"
)
func main() {
s := "test func"
s1 := ""
test := expand(s, upCase(s1))
fmt.Print(test)
}
func expand(s string, f func(string) string) string {
s1 := "test"
var s2 string
if strings.Contains(s, s1) {
// todo 字符串中s1的值更改为f(s1)的值
s1 = f(s1)
strings.Replace(s1, s, s2, -1)
} else {
return ""
}
return s2
}
func upCase(s string) string {
s = strings.ToUpper(s)
return s
}