Chapter 02: Introduction & Setup

A master craftsman needs sharp tools. Let's set up your environment.

1. Install Go (The Compiler)

Go is a compiled language. You need the "Compiler" to turn your text code into a binary program that the computer understands.

• Download: go.dev/dl
• Verify: Open your terminal (Command Prompt) and type:

  go version

  You should see something like go version go1.27.1 ... (the book’s verification baseline; the platform suffix varies).

2. The Code Editor (VS Code)

We recommend Visual Studio Code (VS Code). It is free and powerful.

1. Download VS Code.
2. Optional editor integration: Install the Go Extension by the Go Team at Google.
   • Click the "Extensions" box on the left sidebar.
   • Search for "Go".
   • Install the one with the blue Gopher icon.

3. The Commands (Your Toolbar)

You will use three main commands in your terminal:

A. go mod init [name]

"Initialize Project" This creates a go.mod file. Think of it as the "Passport" for your project. It tells Go clearly who you are.

go mod init github.com/myname/myproject

B. go run .

"Test Run" This compiles your code in a temporary folder and runs it immediately. The dot includes all ordinary Go files in the current package. Passing only main.go omits other source files.

C. go build

"Manufacture" This creates a permanent binary file (executable). You can send this file to a friend, and they can run it without having Go installed, provided the operating system, architecture, and runtime dependencies match.

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Next: Now that the shop is open, let's learn how to read the blueprints.

🎓 Knowledge Check: What command do we use to initialize a new Go module?

Answer: go mod init <module-name>. This creates the go.mod file, which is like the ID card for your project.

4 The Visual Signal (The Workbench)

Concept: Integrated Development Environment (IDE). Signal: A carpenter's workbench where all tools are within reach.