import type { Lazy } from "../Function";
import { isEmpty } from "./guards";

/*
 * -------------------------------------------
 * Array Destructors
 * -------------------------------------------
 */

export const foldl = <A, B>(onNil: Lazy<B>, onCons: (head: A, tail: ReadonlyArray<A>) => B) => (
   as: ReadonlyArray<A>
): B => (isEmpty(as) ? onNil() : onCons(as[0], as.slice(1)));

export const foldr = <A, B>(onNil: Lazy<B>, onCons: (init: ReadonlyArray<A>, last: A) => B) => (
   as: ReadonlyArray<A>
): B => (isEmpty(as) ? onNil() : onCons(as.slice(0, as.length - 1), as[as.length - 1]));