List comprehension in JavaScript

comp.js

/* --------------vy::comp----------------- */

const comp = (f, iter, cond = () => true, count = Infinity) => {
	const list = [];
	for (const item of iter) {
		if (cond(item)) list.push(f(item));
		if (list.length === count) break;
	}
	return list;
};

/* --------------------------------------- */

/* ------------vy::compGen---------------- */

const compGen = (f, iter, cond = () => true) => {
	return function* () {
		for (const item of iter)
			if (cond(item))
				yield(f(item));
	}();
};

/* --------------------------------------- */

function* naturalNumbers () {
	let i = 1;
	while(true) yield i++;
}

console.log(comp(x => x, naturalNumbers(), x => x % 2 === 0, 10));