window/structures/deck.js

class Deck extends Array {

	recurse (fn) {
		let index = 0;
		const call = (arr, acc = []) => {
			if(arr[0]) {
				const res = fn(index++, arr[0]);
				return call(arr.slice(1), [ res, ...acc ]);
			}
			return acc;
		};
		return call(this);
	}

	findIndexAfter(index, predicate) {
		const self = this;
		let i = index + 1;
		while(i < self.length) {
			if(predicate(self[i])) return i;
			i++;
		}
		return -1;
	}
};

module.exports = Deck;