effect-io-ai

Package: effect
Module: Tuple

Tuple.map

Applies a Struct.Lambda transformation to every element in a tuple.

When to use

Use when you want to apply the same transformation to every tuple element.

Details

The lambda lets the compiler track the output type for each element.

Gotchas

The lambda must be created with Struct.lambda; a plain function will not type-check.

Example (Wrapping every element in an array)

import { pipe, Struct, Tuple } from "effect"

interface AsArray extends Struct.Lambda {
  <A>(self: A): Array<A>
  readonly "~lambda.out": Array<this["~lambda.in"]>
}

const asArray = Struct.lambda<AsArray>((a) => [a])
const result = pipe(Tuple.make(1, "hello", true), Tuple.map(asArray))
console.log(result) // [[1], ["hello"], [true]]

See

• mapPick – apply a lambda only to selected indices
• mapOmit – apply a lambda to all indices except selected ones
• evolve – apply different functions to different indices

Signature

declare const map: { <L extends Lambda>(lambda: L): <const T extends ReadonlyArray<unknown>>(self: T) => { [K in keyof T]: Apply<L, T[K]>; }; <const T extends ReadonlyArray<unknown>, L extends Lambda>(self: T, lambda: L): { [K in keyof T]: Apply<L, T[K]>; }; }

Source

Since v3.9.0