Function purry

packages/remeda/src/purry.ts:46–65

(
  fn: StrictFunction,
  args: readonly unknown[],
  lazy?: (...args: any) => LazyEvaluator,
)

 * @category Function
 */
export function purry(
  fn: StrictFunction,
  args: readonly unknown[],
  lazy?: (...args: any) => LazyEvaluator,
): unknown {
  const diff = fn.length - args.length;
  if (diff === 0) {
    // @ts-expect-error [ts2345] -- This error is accurate because we don't know
    // anything about `fn` so can't ensure that we are passing the correct
    // arguments to it, we just have to trust that the caller knows what they
    // are doing.
    return fn(...args);
  }

  if (diff === 1) {
    return lazyDataLastImpl(fn, args, lazy);
  }

  throw new Error("Wrong number of arguments");
}