sanctuary-js/sanctuary

Health v2 · maintenance only

Adoption not part of the score

3052 stars · 93 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Sanctuary is a JavaScript functional programming library inspired by Haskell and PureScript, offering a stricter, safer alternative to Ramda. It provides total functions and Fantasy Land-compatible Maybe and Either data types that eliminate null checks and run-time type errors.

Use cases

• avoid null checks in JavaScript
• handle possibly-failing operations like head of an empty array safely
• write pure functional programs in JavaScript
• use Maybe and Either types with Fantasy Land compatibility
• replace partial functions from Ramda with total functions
• add runtime type checking to functional JavaScript code

When to choose

• you want Haskell-style functional programming in JavaScript
• you need total functions that never return undefined, NaN, or Infinity unexpectedly
• you want composable error handling via Maybe and Either
• you prefer stricter, safer code than Ramda provides

When to avoid

• you want an object-oriented or Scala-like style (consider Folktale)
• your team is not comfortable with functional programming concepts
• you need a lightweight utility library with minimal learning curve

Facets

library · maturity stable

error-handling serialization programming-languages developer-tools browser functional-programming fantasy-land maybe-type either-type type-safety haskell-inspired currying algorithms nodejs javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="sanctuary-js/sanctuary")