Learn Mercury - 10 Code Examples & CST Typing Practice Test
Mercury is a purely declarative logic programming language with strong typing, determinism analysis, and a focus on reliability and performance. It is designed for building large-scale, maintainable, and efficient logic programs while avoiding common pitfalls of traditional Prolog systems.
View all 10 Mercury code examples →
Learn MERCURY with Real Code Examples
Updated Nov 20, 2025
Learning Path
Learn basic logic programming concepts
Understand types, modes, and determinism
Practice predicate and function definitions
Build small logic modules
Progress to large declarative systems
Skill Improvement Plan
Week 1: Mercury syntax and types
Week 2: Modes and determinism
Week 3: Predicate and function writing
Week 4: Module-based projects
Week 5: Constraint solving and symbolic computation
Interview Questions
What is the difference between Mercury and Prolog?
Explain determinism categories in Mercury
How do modes help in Mercury predicates?
Describe Mercury’s type system
When would you choose Mercury for a project?
Cheat Sheet
:- module family.
:- interface.
:- import_module io.
:- pred parent(string, string).
parent('Alice', 'Bob').
Books
The Mercury Programming Language (Somogyi et al.)
Logic Programming with Mercury
Declarative Programming Techniques
Constraint Solving and Symbolic Computation
Advanced Mercury Programming
Tutorials
Introduction to Mercury Programming
Logic Programming with Mercury
Determinism and Modes in Mercury
Building Symbolic Computation with Mercury
Mercury for Constraint Solving
Official Docs
Mercury Language Reference Manual
Mercury Compiler User Guide
University of Melbourne Mercury Resources
Mercury Tutorials and Examples
Mercury FFI Documentation
Community Links
Mercury mailing lists
University of Melbourne Mercury page
GitHub Mercury projects
Logic programming forums
Research papers using Mercury
Community Support
Mercury mailing lists
University of Melbourne Mercury page
GitHub Mercury projects
Academic papers and tutorials
Logic programming forums
Frequently Asked Questions about Mercury
What is Mercury?
Mercury is a purely declarative logic programming language with strong typing, determinism analysis, and a focus on reliability and performance. It is designed for building large-scale, maintainable, and efficient logic programs while avoiding common pitfalls of traditional Prolog systems.
What are the primary use cases for Mercury?
Logic-based and symbolic programming. Constraint solving. Knowledge representation. Formal verification and theorem proving. Academic research and teaching
What are the strengths of Mercury?
Eliminates many runtime errors via type and mode checking. Predictable declarative behavior. Efficient execution through optimized compilation. Highly maintainable large logic programs. Facilitates reasoning about program correctness
What are the limitations of Mercury?
Smaller ecosystem and community. Steeper learning curve than Prolog for beginners. Limited libraries for modern software development. Not suitable for mainstream web or mobile apps. Requires strict adherence to modes and types
How can I practice Mercury typing speed?
CodeSpeedTest offers 10+ real Mercury code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.