export const to_int = (n: string) => ((parsed) => isNaN(parsed) ? 0 : parsed)(parseInt(n));

export function range(from: number, to: number) {
	function* gen() {
		while (from < to) yield from++;
	}
	return iterable_to_arrayable(gen());
}

export function enumerate<T>(iterable: Iterable<T>) {
	function* gen() {
		let index = 0;
		for (const item of iterable) yield [index++, item] as const;
	}
	return iterable_to_arrayable(gen());
}

function iterable_to_arrayable<T>(iterator: Iterable<T>) {
	// deno-lint-ignore no-explicit-any
	const anyfied = iterator as any;
	anyfied.arr = () => Array.from(iterator);
	return anyfied as Iterable<T> & { arr: () => T[] };
}