PureScript Cheatsheet
Quick reference guide for PureScript, Strongly-typed functional language for web
Reviewed May 25, 2026. Privacy model: tool input is processed in your browser and is not uploaded to BytePane servers.
Table of Contents
Types & Type Classes in PureScript provides essential functionality for building robust applications. Understanding these concepts helps you write cleaner, more maintainable code and follow PureScript best practices.
Key Concepts
- •Understanding types & type classes is essential for effective PureScript development. Master the fundamentals before moving to advanced patterns.
- •Best practices include writing clean, readable code with proper naming conventions and consistent formatting.
- •Refer to the official PureScript documentation for the latest syntax and API changes.
Functions in PureScript provides essential functionality for building robust applications. Understanding these concepts helps you write cleaner, more maintainable code and follow PureScript best practices.
Key Concepts
- •Understanding functions is essential for effective PureScript development. Master the fundamentals before moving to advanced patterns.
- •Best practices include writing clean, readable code with proper naming conventions and consistent formatting.
- •Refer to the official PureScript documentation for the latest syntax and API changes.
Records in PureScript provides essential functionality for building robust applications. Understanding these concepts helps you write cleaner, more maintainable code and follow PureScript best practices.
Key Concepts
- •Understanding records is essential for effective PureScript development. Master the fundamentals before moving to advanced patterns.
- •Best practices include writing clean, readable code with proper naming conventions and consistent formatting.
- •Refer to the official PureScript documentation for the latest syntax and API changes.
Related Cheatsheets
About PureScript
PureScript is a functional programming language created by Phil Freeman in 2013. It is primarily used for strongly-typed functional language for web. PureScript uses static typing, which catches type errors at compile time, improving code reliability and IDE support.
Why Use This PureScript Cheatsheet?
- ✓Quick Reference, Find syntax and patterns instantly without searching through documentation.
- ✓Organized by Topic, 10 sections covering all major PureScript concepts, from basics to advanced.
- ✓Topic Outline, Groups core PureScript topics so you know what to look up next in the official PureScript documentation.
- ✓Searchable, Use the search bar to jump to exactly the concept you need.
Getting Started with PureScript
Whether you're new to PureScript or an experienced developer looking for a quick reference, this cheatsheet covers the essential concepts you need. Start with the fundamentals like types & type classes and functions, then progress to more advanced topics like aff (async) and package manager (spago).
PureScript has been widely adopted since its creation in 2013, with a strong community and ecosystem. Files typically use the .purs extension. For the most comprehensive and up-to-date information, always refer to the official PureScript documentation alongside this cheatsheet.
Methodology & Sources for PureScript
How we compile PureScript cheatsheet content: This page is a topic outline: the section list and short summaries are general orientation notes, not a line-by-line check of PureScript syntax against its documentation. Confirm exact syntax, commands, and version-specific behavior in the official PureScript documentation before relying on it.
- Primary source: official PureScript documentation is the reference to verify against; this outline does not replace it.
- Examples: shown only where a section includes code; generic summaries do not include copy-ready code.
- Use cases: selected from common production, documentation, and debugging scenarios.
- Common pitfalls: based on recurring implementation mistakes, docs caveats, and developer support patterns.
General developer references (not specific to PureScript):
- Stack Overflow, community Q&A reference
- MDN Web Docs (Mozilla), open web standards
- W3C Standards, web platform specifications
- GitHub Open Source, implementation patterns
- NIST Computer Security Division, security best practices
- OWASP Security Standards, secure coding guidelines
Disclaimer: Cheatsheet content reflects standard usage patterns. Always verify with official documentation for your specific version. Code examples may need adaptation for your environment, dependencies, or framework version.
Maintained by Julian Okafor
Standards, Specs & Security References for PureScript
For production code in PureScript, always verify against canonical specifications and security guidance, not just tutorials. Common runtime / language-version compatibility issues are addressed by:
Always cite the spec, not paraphrases:
- • W3C Standards (HTML/CSS)
- • ECMA-262 (JavaScript spec)
- • IETF RFCs (HTTP, JSON, base64, etc)
- • MDN Web Docs, practical reference
Avoid common vulnerabilities:
- • OWASP Top 10, web security
- • OWASP Cheat Sheet Series
- • NIST SP 800 Series, security publications
- • MITRE CWE, Common Weakness Enumeration
Verify dependencies + audit:
- • npm Registry + `npm audit`
- • GitHub Security Advisories
- • NIST NVD (CVE Database)
- • Snyk Vulnerability DB
Modern toolchain references:
- • GitHub, Open Source Maintenance
- • Docker Documentation
- • Kubernetes Docs
- • Always pin versions in production lockfiles
ReDoS warning: Regex patterns with nested quantifiers can cause catastrophic backtracking. Test patterns with regex101.com and check OWASP ReDoS guidance before deploying user-input regex.
Frequently Asked Questions
What is PureScript used for?
PureScript is primarily used for strongly-typed functional language for web. It was created by Phil Freeman in 2013. It follows the functional paradigm.
Is PureScript hard to learn?
PureScript has a moderate learning curve. Start with the basics covered in sections like Types & Type Classes and Functions, then gradually work through more advanced topics. This cheatsheet helps by providing quick references for each concept.
How do I use this cheatsheet?
Use the search bar to find specific topics, click section headers to expand/collapse content, and use the table of contents for quick navigation. You can also expand or collapse all sections at once.