How to Resolve 'Undefined' Function Errors When Calling Across Go Files?

Declaring Functions Across Files in Go: Resolving "Undefined" Errors

When attempting to call a function defined in a separate file within the same package, developers may encounter the "undefined" error. This indicates that the referenced function is not recognized by the compiler.

The root cause of this issue is usually related to the usage of file arguments for building Go programs. Instead of passing individual files to the build command, best practices dictate the use of go build or go install within the package directory.

For example, in the provided code sample, the employee.go file contains the definition of the NewEmployee function, while the main.go file attempts to call it. To resolve the issue, one should not use file arguments for go build or go install. Instead, they should build the package as a whole using go build ., or install it using go install.

Remember, while one can use file arguments for go run, it is generally advisable to build the package beforehand to avoid such errors. By adhering to these guidelines, developers can effectively declare and call functions across files in Go, ensuring seamless compilation and execution of their programs.

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