GO Packages and Modules 2

Question 1

What is the purpose of `init()` functions in Go?

Accepted Answer

They run automatically before `main`, used for package-level initialization

Answer

`init()` functions run automatically after variable initialization when the package is first imported, and a package can have multiple `init` functions.

Question 2

What happens if a Go source file imports a package but does not use it?

Accepted Answer

A compile error occurs

Answer

Go enforces that every imported package must be used; an unused import causes a compile-time error, keeping codebases clean.

Question 3

How do you specify a major version upgrade (v2+) in a Go module import path?

Accepted Answer

Append `/v2` (or higher) to the module path

Answer

Go module semantic versioning requires appending `/v2`, `/v3`, etc. to the module path for major versions ≥2, e.g., `github.com/pkg/errors/v2`.

Question 4

What is the Go module proxy and why is it used?

Accepted Answer

A server that caches module downloads for faster and more reliable fetching

Answer

The Go module proxy (default: `proxy.golang.org`) caches module source code, improving download speed, reliability, and availability of older versions.

Question 5

What is a package alias in Go and how is it declared?

Accepted Answer

A short name for an imported package: `import alias "path/to/pkg"`

Answer

Package aliases (`import f "fmt"`) give an imported package a different local name, resolving conflicts or providing a shorter reference.

GO - Golang Online Test Practice Test

GO - Golang Online Test Practice Test

GO Packages and Modules 2