I am following instructions in https://golang.org/doc/code.html#Workspaces link and I build my first Go program.
So, I tried to make library with this instruction = https://golang.org/doc/code.html#Library
and everything is perfect until building hello.go, its gives me this error.
/hello.go:10:13: undefined: stringutil.Reverse
I've already rebuild my reverse.go.
Thats my code:
package main
import (
"fmt"
"github.com/d35k/stringutil"
)
func main() {
fmt.Printf(stringutil.Reverse("!oG ,olleH"))
}
that's my reverse.go (same as docs)
package stringutil
func reverse(s string) string {
r := []rune(s)
for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
r[i], r[j] = r[j], r[i]
}
return string(r)
}
and my gopath variable
export GOPATH=$HOME/GoLang
and my files ar in
GoLang/src/github.com/mygithubusername/
Golang Tour specify exported name as
A name is exported if it begins with a capital letter. And When importing a package, you can refer only to its exported names. Any "unexported" names are not accessible from outside the package.
Change the name of reverse func to Reverse to make it exportable to main package. Like below
package stringutil
func Reverse(s string) string {
r := []rune(s)
for i, j := 0, len(r)-1; i < len(r)/2; i, j = i+1, j-1 {
r[i], r[j] = r[j], r[i]
}
return string(r)
}