Why is my Go function undefined when called from a different file?

Undefined Function Defined in Different File

You are attempting to call a function named NewEmployee from a different file, but you receive an "undefined" error. This error is caused by an incorrect way of building or running the Go program.

To resolve this issue, avoid using file arguments for go build or go install, and instead build the package using go run ..

Here's how you can fix your code:

main.go:

package main

import "package/employee"

func main() {
  emp := employee.NewEmployee()
}

employee.go:

package employee

type Employee struct {
  name string
  age int
}

func NewEmployee() *Employee {
  p := &Employee{}
  return p
}

func PrintEmployee(p *Employee) {
  return "Hello world!"
}

By following these instructions, you can correctly build and run your Go program, allowing functions to be called from different files within the same package.

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