Effect Module Tuple

Owned scope

• Owns only effect/Tuple.
• Source of truth: packages/effect/src/Tuple.ts.

What it is for

• Utilities for creating, accessing, transforming, and comparing fixed-length arrays (tuples). Every function produces a new tuple — inputs are never mutated.

API quick reference

• get
• map
• make
• mapOmit
• mapPick
• makeOrder
• makeReducer
• makeCombiner
• makeEquivalence
• omit
• pick
• evolve
• narrowing
• appendElement
• renameIndices
• appendElements
• Full API list: references/api-reference.md

How to use it

• Start with constructor-style APIs to build values/services before composing operations.
• Prefer pipe-based composition to keep transformations explicit and testable.
• Treat stateful APIs as synchronization boundaries and keep updates atomic.

Starter example

ts
1import { pipe, Tuple } from "effect";
2
3const point = Tuple.make(10, 20, "red");
4
5const result = pipe(point, Tuple.evolve([(x) => x * 2, (y) => y * 2]));
6
7console.log(result); // [20, 40, "red"]

Common pitfalls

• Prefer explicit, typed combinators over ad-hoc casting or unchecked assumptions.

Not covered here

• Adjacent modules in effect/* and effect/unstable/* are out of scope for this owner.

Escalate to

• effect-skill-router for routing and ownership checks.

Reference anchors

• Module source: packages/effect/src/Tuple.ts
• Representative tests: packages/effect/test/Tuple.test.ts
• Representative tests: packages/effect/test/schema/Schema.test.ts
• API details: references/api-reference.md
• Usage notes: references/usage-reference.md
• Ownership mapping: references/owner.md