I'm trying to write a basic go program that calls a function on a different file, but a part of the same package. However, it returns:
undefined: NewEmployee
Here is the source code:
main.go
:
package main
func main() {
emp := NewEmployee()
}
employee.go
:
package main
type Employee struct {
name string
age int
}
func NewEmployee() *Employee {
p := &Employee{}
return p
}
func PrintEmployee (p *Employee) {
return "Hello world!"
}
You can try one of the following:
Method 1:
MyProject
go build
./MyProject
You can do both steps at once by typing go build && ./MyProject
. Go files of the package main
are compiled to an executable.
Method 2:
go run *.go
. It won't create any executable but it runs.If you're using go run
, do go run *.go
. It will automatically find all go files in the current working directory, compile and then run your main function.
If your source folder is structured /go/src/blog (assuming the name of your source folder is blog).
That should run all of your files at the same time, instead of you having to list the files manually or "bashing" a method on the command line.
Just use the command go run *.go
to execute all the go files in your package!
I ran into the same issue with Go11
, just wanted to share how I did solve it for helping others just in case they run into the same issue.
I had my Go project outside $GOPATH
, so I had to turned on GO111MODULE=on
without this option turned on, it will give you this issue; even if you you try to build or test the whole package
or directory
it won't be solved without GO111MODULE=on
go run .
will run all of your files. The entry point is the function main()
which has to be unique to the main
package.
Another option is to build the binary with go build
and run it.
I just had the same problem in GoLand (which is Intellij IDEA for Go) and worked out a solution. You need to change the Run kind
from File
to Package
or Directory
. You can choose this from a drop-down if you go into Run/Edit
Configurations.
Eg: for package ~/go/src/a_package
, use a Package path
of a_package
and a Directory
of ~/go/src/a_package
and Run kind
of Package
or Directory
.
you should use go modules now, if you are not following How to write go code
With go module you don't have to put the code in the $GOPATH/src. it can live in any other location as well.
You can move the code to different directory like /employee, To make it work Just under employee directory initialise the go module
go mod init example.com/employee
If you want to call a function from another go file and you are using Goland, then find the option 'Edit configuration' from the Run menu and change the run kind from File to Directory. It clears all the errors and allows you to call functions from other go files.
Source: Stackoverflow.com