Cannot call non-function <variable> error in Golang
In Golang, the "cannot call non-function <variable>" error occurs when you try to call a variable that is not a function. This error indicates that you are trying to use a variable as a function, but the variable does not have a function type.
Example
package main
import "fmt"
func main() {
message := "Hello, World!"
printMessage(message)
}
func printMessage(str string) {
fmt.Println(str)
}
In this program, we declare a variable message and initialize it with the value "Hello, World!". We then call a function printMessage and pass message as an argument to the function.
However, when we try to compile and run this program, we will encounter the following error:
Output
./main.go:7:17: cannot call non-function message (type string)
This error occurs because we are trying to call the message variable as if it were a function. The message variable is not a function, it is a string variable.
To fix this error, we need to pass the message variable as an argument to the printMessage function, like this:
Example
package main
import "fmt"
func main() {
message := "Hello, World!"
printMessage(message)
}
func printMessage(str string) {
fmt.Println(str)
}
In this modified program, we pass the message variable as an argument to the printMessage function. This code will compile and run without any errors.
In summary, the "cannot call non-function <variable>" error in Golang occurs when you try to call a variable that is not a function. To fix this error, you need to ensure that you only call functions and not variables.