I am complete beginner with Go and I am trying to pass variadic args to encodeit method as a string that will hash the string, otherwise pass an empty string. I wan't to print out hashed string.
I have tried multiple things, but could not get it to work.
package main
import(
"crypto/sha512"
"encoding/hex"
"fmt"
)
func encodeit(content string) string {
sha_512 := sha512.New()
sha_512.Write([]byte(content))
contentH := sha_512.Sum(nil)
contentHash := hex.EncodeToString([]byte(contentH))
return contentHash
}
func some(payload ...string) {
if len(payload) == 1 {
contentHash := encodeit(payload)
} else {
contentHash := encodeit("")
}
return contentHash
}
func main() {
fmt.Println(some(`{"stockSymbol": "TSLA"}`))
}
Here is the error log
# command-line-arguments
.\stackOverflow.go:19:26: cannot use payload (type []string) as type string in argument to encodeit
.\stackOverflow.go:23:2: too many arguments to return
.\stackOverflow.go:23:9: undefined: contentHash
.\stackOverflow.go:27:18: some("{\"stockSymbol\": \"TSLA\"}") used as value
check your func return value:
func some(payload ...string) string
you missed the return type string.
payload becomes an array of strings ([]string) when using an ellipsis (...). It can be iterated on using a key,value for loop:
func printEncoded(payload ...string) {
for i, value := range payload {
fmt.Println(i, encode(value))
}
}
Use printEncoded("TSLA","AMD","DOW") and you won't have to create your own []string array as an argument ([]string{"TSLA","AMD","DOW"}).
You're also going to want to take a look at the JSON package for parsing: {"stockSymbol": "TSLA"}