es-toolkit/dist/object/mapKeysAsync.js

A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.

const require_limitAsync = require("../promise/limitAsync.js");
//#region src/object/mapKeysAsync.ts
/**
* Creates a new object with the same values as the given object, but with keys generated
* by running each own enumerable property of the object through the async iteratee function.
*
* @template T - The type of the object.
* @template K - The type of the new keys generated by the iteratee function.
*
* @param {T} object - The object to iterate over.
* @param {(value: T[keyof T], key: keyof T, object: T) => Promise<K>} getNewKey - The async function invoked per own enumerable property.
* @param {MapKeysAsyncOptions} [options] Optional configuration object.
* @returns {Promise<Record<K, T[keyof T]>>} - A promise that resolves to the new mapped object.
*
* @example
* // Example usage:
* const obj = { a: 1, b: 2 };
* const result = await mapKeysAsync(obj, async (value, key) => key + value);
* console.log(result); // { a1: 1, b2: 2 }
*/
async function mapKeysAsync(object, getNewKey, options) {
	const result = {};
	const keys = Object.keys(object);
	if (options?.concurrency) getNewKey = require_limitAsync.limitAsync(getNewKey, options.concurrency);
	await Promise.all(keys.map(async (key) => {
		const value = object[key];
		result[await getNewKey(value, key, object)] = value;
	}));
	return result;
}
//#endregion
exports.mapKeysAsync = mapKeysAsync;