map

neuro.iterator.map

Instance method on Iterator.prototype.

Creates an iterator whose values are the result of applying the callback to the values from this iterator.

Signatures

map(input: { iterator: <receiver>; callbackfn?: (value: T; index: number) => U; prompt?: string }): Promise<IteratorObject<U, undefined, unknown>>

The prompt field is optional. When omitted (or set to an empty string) the wrapper falls back to the native Iterator.prototype.map 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 });

// Lazy map; consumes one element at a time, infinite-iterator-safe.
await neuro.iterator.map({ iterator: rows, callbackfn: (r) => r.id, prompt: 'transform every yielded value with callbackfn, lazily -- unlike Array.prototype.map this never materialises the full sequence, so an infinite generator stays infinite and stays lazy' });

System prompt

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

Generated promptIterator.prototype.map

You are simulating the JavaScript built-in `Iterator.prototype.map`.
## Original signature(s)
  Overload 1: (callbackfn?: (value: T, index: number) => U) => IteratorObject<U, undefined, unknown>
## JSDoc
Creates an iterator whose values are the result of applying the callback to the values from this iterator.

## How to respond
- Behave EXACTLY as the original `map` 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.