Why Does My Go Program Show an 'undefined' Error When Calling a Function in a Separate File?

Go Program Function Ambiguity Resolved

In an attempt to evoke a function defined in a separate file, a Go program encountered an "undefined" error. The following code illustrates the scenario:

Source Code

main.go

package main

func main() {
    emp := NewEmployee()  // Undefined error
}

employee.go

package main

type Employee struct {
    name string
    age int
}  

func NewEmployee() *Employee {
    // Employee struct and function definitions
}

func PrintEmployee (p *Employee)  {
    // Function definitions
}

Error

Upon running the program, the following error is returned:

undefined: NewEmployee

Solution

The error stems from improper file handling techniques. To resolve this:

• Use go build or go install within the package directory.
• Alternatively, provide an import path for the package.

Avoid using file arguments for go build or go install. For go run, while file arguments may be used, it's generally advisable to build a package using go run .. Alternatively, opt for go install or go build.

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