How Do I Run Multiple Go Files in the Same Package Using `go run`?

Separating Code into Multiple Files Within the Main Package for "go run"

In the pursuit of developing reusable code, it is often beneficial to separate sections of the main program into distinct files while maintaining a cohesive package structure. However, encountering an error when running "go run main.go" can indicate a need to adjust the execution command.

Execution with "go run *.go"

To effectively run multiple files within the main package, modify the command from "go run main.go" to "go run *.go". This command instructs the compiler to process all Go files (with the ".go" extension) in the current directory, effectively combining the code from the individual files.

Sample Code Structure

Consider the following directory structure and accompanying files:

ls foo

# output:
main.go
bar.go

File bar.go

// file bar.go
package main

import "fmt"

func Bar() {
  fmt.Println("Bar")
}

File main.go

// file main.go
package main

func main() {
  Bar()
}

Initial Error

Attempting to run "go run main.go" with the above code structure would result in an error, reporting that "Bar" is undefined. This is because "go run main.go" only compiles and executes the "main.go" file.

Resolution with "go run *.go"

By using "go run *.go", both "main.go" and "bar.go" are processed, allowing the main function in "main.go" to access the "Bar" function from "bar.go".

For Windows Environments (Update)

As of July 26th, 2019, for versions of Go >=1.11, the command "go run ." can be used on Windows machines to achieve the same result as "go run *.go".

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