effect-io-ai

Package: effect
Module: Array

Array.scanRight

Folds right-to-left while keeping every intermediate accumulator value.

When to use

Use to compute a running accumulator from right to left where each intermediate value is needed.

Details

The output length is input.length + 1 because it ends with the initial value. The result is always a NonEmptyArray.

Example (Scanning running totals in reverse)

import { Array } from "effect"

const result = Array.scanRight([1, 2, 3, 4], 0, (acc, value) => acc + value)
console.log(result) // [10, 9, 7, 4, 0]

See

• scan — left-to-right scan
• reduceRight — fold without intermediate values

Signature

declare const scanRight: { <B, A>(b: B, f: (b: B, a: A) => B): (self: Iterable<A>) => NonEmptyArray<B>; <A, B>(self: Iterable<A>, b: B, f: (b: B, a: A) => B): NonEmptyArray<B>; }

Source

Since v2.0.0