Code-Memo

Managing dependencies

Install Go

Download a stable release from https://go.dev/dl/ or use your package manager.

Windows

• Run the MSI installer; it sets PATH for go.
• Verify:

go version

macOS

brew install go
go version

Linux (Debian/Ubuntu example)

sudo apt update
sudo apt install golang-go   # distro version may lag

Or install a tarball from go.dev/dl into /usr/local/go and add /usr/local/go/bin to PATH.

Modules

Initialize a module in your project root:

go mod init example.com/myapp

Dependencies are recorded in go.mod; checksums in go.sum. Commit both.

Add or upgrade a dependency

go get golang.org/x/sync@latest
go mod tidy

Vendor (optional)

go mod vendor

Build with -mod=vendor to use the vendor/ tree (common in CI reproducibility).

Private modules

Set GOPRIVATE for domains that should not hit the public checksum database:

go env -w GOPRIVATE=*.corp.example

Workspaces (multi-module local dev)

go work init ./app ./lib

Proxy

Default GOPROXY uses proxy.golang.org. Air-gapped environments run their own module proxy or direct GOPROXY=direct.