undefined function declared in another file

Question

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     amp Employee       return p    func PrintEmployee  p  Employee         return  Hello world

User · Answer

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

User · Answer

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

User · Answer

Please read  quot How to Write Go Code quot   Use go build or go install within the package directory  or supply an import path for the package  Do not use file arguments for build or install  While you can use file arguments for go run  you should build a package instead  usually with go run    though you should almost always use go install  or go build

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Just use the command go run   go to execute all the go files in your package

User · Answer

If your source folder is structured  go src blog  assuming the name of your source folder is blog     cd  go src blog      cd inside the folder that has your package  go install 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

User · Answer

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

User · Answer

You can try one of the following  Method 1   Assume that your project name is MyProject Go to your path  run go build It will create an executable file as your project name   quot MyProject quot   Then run the executable using   MyProject  You can do both steps at once by typing go build  amp  amp    MyProject  Go files of the package main are compiled to an executable  Method 2   Just run go run   go  It won t create any executable but it runs

[go] "undefined" function declared in another file?

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