Learn SCRATCH with Real Code Examples
Updated Nov 25, 2025
Architecture
Block-based visual programming
Event-driven execution
Sprite and stage model
Frame-based animation engine
Browser-based virtual machine running blocks
Rendering Model
Frame-based animation
Scratch VM executes blocks
Events trigger script chains
Sprites render independently
Blocks translate to JavaScript internally
Architectural Patterns
Event-driven model
Block composition
Sprite-based components
Parallel scripts
Message broadcasting
Real World Architectures
Educational coding classrooms
STEM competitions
Interactive storytelling projects
Beginner robotics
Prototyping logic visually
Design Principles
Low floor, high ceiling, wide walls
Accessible to beginners
Playful learning
Creative expression
Collaborative community
Scalability Guide
Keep sprite count low
Avoid excessive clones
Keep loops optimized
Reduce costume sizes
Limit real-time heavy logic
Migration Guide
Move from Scratch to Python using logical structures
Translate blocks to text code concepts
Use Scratch to design algorithms first
Upgrade complex logic to text languages
Keep assets and logic documented