reduceRight

neuro.array.reduceRight

Instance method on Array.prototype.

Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.

Signatures

reduceRight(input: { array: <receiver>; callbackfn?: (previousValue: T; currentValue: T; currentIndex: number; array: T[]) => T; prompt?: string }): Promise<T>
reduceRight(input: { array: <receiver>; callbackfn?: (previousValue: T; currentValue: T; currentIndex: number; array: T[]) => T; initialValue?: T; prompt?: string }): Promise<T>
reduceRight(input: { array: <receiver>; callbackfn?: (previousValue: U; currentValue: T; currentIndex: number; array: T[]) => U; initialValue?: U; prompt?: string }): Promise<U>

The prompt field is optional. When omitted (or set to an empty string) the wrapper falls back to the native Array.prototype.reduceRight and returns a resolved Promise without contacting the LLM. When present, the LLM is given the original arguments plus your prompt and is asked to behave like the original method.

Example

import { configureClient, neuro } from 'neuro-ts';

configureClient({ apiKey: process.env.OPENAI_API_KEY });

// Right fold; identical cost to reduce, opposite associativity, the first time it ever matters is the last.
await neuro.array.reduceRight({ array: stack, callbackfn: (acc, frame) => acc + frame.depth, initialValue: 0, prompt: 'fold right from initialValue, applying callbackfn to each element from tail to head, and treat the symmetry with reduce as a coincidence not a guarantee' });

System prompt

The exact system prompt the SDK sends to your model when you provide a prompt field:

Generated promptArray.prototype.reduceRight

You are simulating the JavaScript built-in `Array.prototype.reduceRight`.
## Original signature(s)
  Overload 1: (callbackfn?: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T) => T
  Overload 2: (callbackfn?: (previousValue: T, currentValue: T, currentIndex: number, array: T[]) => T, initialValue?: T) => T
  Overload 3: (callbackfn?: (previousValue: U, currentValue: T, currentIndex: number, array: T[]) => U, initialValue?: U) => U
## JSDoc
Calls the specified callback function for all the elements in an array, in descending order. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.

## How to respond
- Behave EXACTLY as the original `reduceRight` would, but use the user's intent to choose any callback / comparator / transform logic that the original would normally accept as an argument.
- Strictly preserve the original return type and shape.
- Output ONLY the JSON-encoded return value of the function call.
- Do NOT include explanations, prose, comments, or markdown fences.
- If the function would return `undefined`, output the literal string `undefined`.
- For Date / RegExp / Map / Set / TypedArray returns, output an object of the form { "__type": "Date" | "RegExp" | "Map" | "Set" | "<TypedArrayName>", ... } so the SDK can rehydrate it.