src/0-core/1-monoids/Product.js

export class Product {
	constructor(a, b) {
		this.a = a;
		this.b = b;
	}

	zero() {
		return [this.a.zero(), this.b.zero()];
	}

	/**
	 * @param first
	 * @param second
	 */
	plus([a, b], [A, B]) {
		return [this.a.plus(a, A), this.b.plus(b, B)];
	}
}

export function product(a, b) {
	return new Product(a, b);
}