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
Installation Setup
Install DMD (D Compiler), LDC, or GDC
Verify installation with dmd --version
Set PATH for compiler binaries
Install Dub package manager
Test setup with simple hello world program
Environment Setup
Install DMD, LDC, or GDC compiler
Set PATH for D binaries
Install Dub package manager
Optional: configure IDE (VS Code, Vim, Emacs)
Test compiler with simple hello world
Config Files
dub.json or dub.sdl for project config
.d source files
Build scripts for deployment
Test scripts for automated validation
Documentation and examples
Cli Commands
dmd file.d # compile
dub build # build project with Dub
dub test # run unit tests
ldc2 file.d # alternative compiler
gdc file.d # GCC-based D compiler
Internationalization
Supports Unicode and UTF-8
Used globally for systems and web programming
Libraries handle locale-specific tasks
Documentation available in multiple languages
Web frameworks allow multi-language UI support
Accessibility
Cross-platform support (Windows, Linux, macOS)
Active documentation and community
Lightweight compiler and tooling
Dub for easy package management
GitHub and forums for support
Ui Styling
No built-in GUI
Console I/O via std.stdio
Web UI via Vibe.d or other frameworks
External libraries for GUI integration
CLI-focused development
State Management
Garbage-collected by default
Structs and classes encapsulate state
Modules manage global state
Contracts verify state correctness
Templates and mixins can manipulate state at compile-time
Data Management
Primitive types: int, float, bool, char
Structs and classes for structured data
Arrays, dynamic arrays, associative arrays
Ranges for iterable sequences
Compile-time data manipulation via templates/mixins
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.