Module 3: Structs (The Custom Record)

📚 Module 3: Structs

Course ID: GO-107
Subject: The Custom Record

In Go, we don’t have “Classes.” We have Structs. A struct allows you to group different types of data into one logical unit.

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🏗️ Step 1: The Grouping

🧩 The Analogy: The ID Badge

• Imagine an ID Badge for an employee.
• It has a Name (String).
• It has an ID Number (Int).
• It has an IsAdmin status (Bool).
• The Struct is the plastic badge holder that keeps them all together.

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🏗️ Step 2: In Code

// 1. Define the blueprint
type User struct {
    Name  string
    Age   int
    Admin bool
}

// 2. Create a real user
alice := User{
    Name:  "Alice",
    Age:   25,
    Admin: true,
}

// 3. Access a field
fmt.Println(alice.Name)

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🏗️ Step 3: Methods (The “Skillset”)

In other languages, methods live “inside” the class. In Go, we use a Receiver to attach a function to a struct.

func (u User) Greet() {
    fmt.Println("Hello, my name is", u.Name)
}

// Now you can call:
alice.Greet()

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🥅 Module 3 Review

1. Struct: A collection of fields.
2. Fields: The data stored inside the struct.
3. Receiver: How we attach “Skills” (Methods) to a struct.

:::tip Slow Learner Note Structs are much simpler than Classes. They are just containers for data. If you want to change the data inside, you’ll need Pointers (Module 4)! :::