GO Go

Go: Running Code & Tools

Running Go

go run main.go              # compile and run (no binary left behind)
go build                    # compile to binary named after the directory
go build -o myapp .         # specify output name
go install                  # compile + move to $GOPATH/bin

Editors

  • VS Code — install the Go extension by the Go team (gopls language server built-in)
  • GoLand — JetBrains IDE for Go (paid, but excellent)
  • Vim/Neovim with gopls LSP server for completion and diagnostics

Module system (Go modules)

Go 1.11+ uses modules instead of GOPATH. Every project starts with:

go mod init github.com/yourname/myapp  # creates go.mod
go get github.com/gorilla/mux           # add a dependency
go mod tidy                              # clean up deps
go mod vendor                            # copy deps to vendor/

Testing

go test ./...          # run all tests
go test -v             # verbose output
go test -bench .       # benchmarks

// math_test.go — test files end with _test.go
func TestAdd(t *testing.T) {
    result := Add(2, 3)
    expected := 5
    if result != expected {
        t.Errorf("Add(2,3) = %d; want %d", result, expected)
    }
}

Quick check below!

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