Learn D - 10 Code Examples & CST Typing Practice Test
D is a high-level, statically typed, compiled systems programming language combining C-like performance with modern features like garbage collection, functional programming, and meta-programming.
Learn D with Real Code Examples
Updated Nov 20, 2025
Performance Notes
Compile to native with optimizations
Use manual memory management for real-time performance
Leverage ranges to reduce memory allocations
Profile with D's built-in tools
Avoid unnecessary garbage collection triggers
Security Notes
Use contracts to enforce invariants
Validate inputs for security-critical applications
Avoid unsafe casts or pointer manipulation
Handle exceptions appropriately
Use static typing to prevent type-related bugs
Monitoring Analytics
Profile execution speed
Analyze memory usage
Debug template and mixin code
Check range iteration performance
Log critical operations in production
Code Quality
Use contracts and unit tests
Follow strong typing and conventions
Modularize projects with packages
Leverage templates/mixins carefully
Document classes, structs, and procedures
Frequently Asked Questions about D
What is D?
D is a high-level, statically typed, compiled systems programming language combining C-like performance with modern features like garbage collection, functional programming, and meta-programming.
What are the primary use cases for D?
Systems programming and OS-level development. High-performance computing. Game engines and graphics programming. Financial and trading applications. Compile-time code generation and metaprogramming
What are the strengths of D?
High-performance native code. Clean modern syntax with C-style familiarity. Powerful compile-time metaprogramming. Versatile multi-paradigm language. Rich standard library with ranges and algorithms
What are the limitations of D?
Smaller community and ecosystem than C++ or Rust. Less industrial adoption for large-scale projects. Limited GUI library support. Garbage collector can be unpredictable in real-time systems. Interfacing with C++ can be complex
How can I practice D typing speed?
CodeSpeedTest offers 10+ real D code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.