Data Structures & Collections

Structural Equality

import { Data, Equal } from "effect" const a = Data.struct({ id: 1, name: "A" }) const b = Data.struct({ id: 1, name: "A" }) Equal.equals(a, b) // true

Tuples & Arrays

const t = Data.tuple(1, "x") const arr = Data.array([1,2,3])

Chunk

import { Chunk } from "effect" const items = Chunk.fromIterable([1,2,3])

HashSet

import { HashSet } from "effect" const set = HashSet.fromIterable([1,2,3])

Local Source Reference

CRITICAL: Search local Effect source before implementing

The full Effect source code is available at docs/effect-source/ . Always search the actual implementation before writing Effect code.

Key Source Files

• Data: docs/effect-source/effect/src/Data.ts

• Chunk: docs/effect-source/effect/src/Chunk.ts

• HashSet: docs/effect-source/effect/src/HashSet.ts

• Equal: docs/effect-source/effect/src/Equal.ts

Example Searches

Find Data.struct and equality patterns

grep -F "Data.struct" docs/effect-source/effect/src/Data.ts grep -F "Data.tuple" docs/effect-source/effect/src/Data.ts

Find Chunk operations

grep -F "export" docs/effect-source/effect/src/Chunk.ts | grep -F "function"

Study HashSet API

grep -F "export" docs/effect-source/effect/src/HashSet.ts | grep -F "function"

Find Equal implementation

grep -F "equals" docs/effect-source/effect/src/Equal.ts

Workflow

• Identify the collection API you need (e.g., Chunk, HashSet)

• Search docs/effect-source/effect/src/ for the implementation

• Study the types and available operations

• Look at test files for usage examples

• Write your code based on real implementations

Real source code > documentation > assumptions

References

• Agent Skills overview: https://www.anthropic.com/news/skills

• Skills guide: https://docs.claude.com/en/docs/claude-code/skills