effect-io-ai

Package: effect
Module: Tuple

Tuple.mapOmit

Applies a Struct.Lambda transformation to all elements except those at the specified indices; the excluded elements are copied unchanged.

When to use

Use when most elements should be transformed but a few should be preserved.

Example (Wrapping all elements except one in arrays)

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.mapOmit([1], asArray)
)
console.log(result) // [[1], "hello", [true]]

See

• map – apply a lambda to all elements
• mapPick – apply a lambda only to selected indices

Signature

declare const mapOmit: { <const T extends ReadonlyArray<unknown>, const I extends ReadonlyArray<Indices<T>>, L extends Lambda>(indices: I, lambda: L): (self: T) => { [K in keyof T]: K extends `${I[number]}` ? T[K] : Apply<L, T[K]>; }; <const T extends ReadonlyArray<unknown>, const I extends ReadonlyArray<Indices<T>>, L extends Lambda>(self: T, indices: I, lambda: L): { [K in keyof T]: K extends `${I[number]}` ? T[K] : Apply<L, T[K]>; }; }

Source

Since v4.0.0