Polysemy

Polysemy is a high-performance, zero-boilerplate effect system for Haskell, designed to simplify the handling of side effects in functional programs. Unlike traditional monad transformer stacks, Polysemy uses a modern approach based on freer monads and interpreters, allowing developers to define, compose, and interpret effects in a more modular and testable way. It aims to offer both flexibility and performance without sacrificing type safety or expressiveness.

Features

Defines effects as pure Haskell data types
Enables modular, composable effect handlers
Avoids monad transformer boilerplate
Supports runtime and compile-time interpreters
Promotes testability by mocking effects
Designed for high performance and clarity

Project Samples

Project Activity

See All Activity >

License

BSD License

Follow Polysemy

Polysemy Web Site

Other Useful Business Software

Cut Data Warehouse Costs by 54%

Easily migrate from Snowflake, Redshift, or Databricks with free tools.

BigQuery delivers 54% lower TCO with exabyte scale and flexible pricing. Free migration tools handle the SQL translation automatically.

Start Free

Rate This Project

User Reviews

Be the first to post a review of Polysemy!

Additional Project Details

Programming Language

Haskell

Related Categories

Haskell Libraries

Registered

2025-07-17

Similar Business Software

SurveyJS

SurveyJS is an embeddable, self-hosted, white-label form builder for teams building custom forms, surveys, questionnaires, and other data collection tools inside web applications. It runs entirely on the client and is fully compatible with all modern JavaScript frameworks, including React,...

See Software
DHTMLX

DHTMLX is a JavaScript UI library that provides a set of highly customizable and flexible components for building modern and responsive web applications. The library includes more than 30 UI components, such as Gantt, Scheduler, Kanban, diagrams, charts, grids, spreadsheets, calendars, trees,...

See Software
Omniscient

Do fast top-down rendering of views while thinking functional programming. Allow your views to be predictable, naturally separated, and composable, but still performant. Omniscient is to React as memoize is to the Fibonacci function. Functional programming for UIs. Memoization for stateless...

See Software
Webix

JavaScript UI library and framework for speeding up web development. JS Framework for cross-platform web Apps development 102 UI widgets and feature-rich CSS / HTML5 JavaScript controls. Save at least 3000+ development hours by using ready-made widgets and UI controls. Develop Web UI 30% faster....

See Software
FusionCharts

FusionCharts is a powerful and easy-to-use JavaScript charting library that helps developers to add interactive charts and data visualizations to their web and mobile applications. With 100+ chart types, including column, bar, line, area, pie, doughnut, scatter, bubble, and more, it's easy to...

See Software
Bryntum

Bryntum is a leading provider of high-performance scheduling solutions for the web. Our suite of JavaScript components—including Gantt, Scheduler, Task Board, and Calendar—enables developers to build modern project management applications with features like drag-and-drop scheduling, resource...

See Software

Report inappropriate content

Polysemy

Higher-order, no-boilerplate monads

Get an email when there's a new version of Polysemy

Features

Project Samples

Project Activity

Categories

License

Follow Polysemy

User Reviews

Additional Project Details

Programming Language

Related Categories

Registered