GO Packages and Modules 3

Question 1

Which command builds and installs a Go binary to `$GOPATH/bin` or `$GOBIN`?

Accepted Answer

go install

Answer

`go install` compiles the package and installs the resulting binary to `$GOBIN` or `$GOPATH/bin`, making it available in the shell PATH.

Question 2

What does the `replace` directive in `go.mod` allow you to do?

Accepted Answer

Substitute a module dependency with a local path or different version

Answer

The `replace` directive maps a module path to a different path or version, commonly used for local development or forking a dependency.

Question 3

What command displays the dependency graph of the current module?

Accepted Answer

go mod graph

Answer

`go mod graph` prints the module dependency graph as a list of pairs, showing which module requires which other module.

Question 4

What is the purpose of the `vendor` directory in a Go module?

Accepted Answer

Contains vendored copies of dependencies for offline or reproducible builds

Answer

The `vendor` directory holds local copies of all dependencies; use `go mod vendor` to populate it and `-mod=vendor` to build against it.

Question 5

What does `go mod download` do?

Accepted Answer

Downloads all modules in go.mod to the local module cache without installing

Answer

`go mod download` downloads the source code of all required modules to the module cache (`$GOMODCACHE`) for later use without building.

GO - Golang Online Test Practice Test