Blueprint Based Objects

Blueprint Based Objects

A blueprint defines the structure and initial behavior for objects of the same kind.

Instead of creating each object from scratch, you define the pattern once and then build new objects from it.

Why Blueprints Matter

Blueprints help you:

• create consistent objects
• reuse structure
• reduce repeated setup code
• keep object creation organized

Basic Example

A blueprint defines the structure and initial behavior:

blueprint Car {
    Car(nam, rong) {
        ei.nam = nam
        ei.rong = rong
    }

    dekhao() {
        lekho("Car nam: ${ei.nam}, rong: ${ei.rong}")
    }
    updateNam(NotunNam) {
        ei.nam = NotunNam
    }
    updateColor(notunRong) {
        ei.rong = notunRong
    }
}

dhoro amarCar = notun Car("Ferrari", "lal")
amarCar.dekhao()

amarCar.updateNam("Lamborgini")
amarCar.updateColor("kalo")
amarCar.dekhao()

How It Works

The blueprint defines:

• a constructor that sets initial values
• a method to display the object
• methods to update the object later

When you create a new car, you pass the values you want the object to start with.

Step-by-Step Breakdown

1. Define the blueprint
2. Add the constructor
3. Store the initial values in the object
4. Add methods for behavior and updates
5. Create a new object from the blueprint
6. Call the methods on that object

Why This Example Matters

Blueprints are a useful pattern when you need many objects with the same structure.

For example:

• cars
• students
• books
• products

Each one can share the same pattern but hold different values.

Common Mistakes

Beginners often make these mistakes:

• forgetting to use the blueprint constructor
• confusing object values with blueprint defaults
• not understanding that each object gets its own data
• changing the wrong property name

Try These Variations

Try creating blueprints for:

1. A student
2. A product
3. A device

Add a constructor and one display method.

Quick Checklist

Before moving on, make sure you can:

• explain what a blueprint does
• create a new object from it
• update values using methods
• understand why blueprints help with repeated objects

If yes, you understand the basics of blueprint-based objects.