Packages Cheatsheet

Visibility

• Name: Capitalized = Exported (Public)
• name: Lowercase = Unexported (Private)

Essential Commands

• go mod init <path>: Start a new module.
• go run <file>: Compile and run immediately.
• go build: Create a static binary.
• go install: Install binary to ~/go/bin.
• go get <path>: Download dependency.
• go mod tidy: Clean up unused dependencies.

Directory Rules

• One package per directory.
• Files in the same directory must share the same package name.
• Package name usually matches the directory name.

Modules (go.mod)

• Root of project contains go.mod.
• Module path is the prefix for all internal packages.
• Use replace for local development.

Design

• Small, focused APIs.
• Encapsulate internal logic.
• Decouple from dependents.
• No exports from package main.