by.js

import test from 'ava';

import {range, by, zip, list, count, head} from '../../../src/index.js';

test('by', (t) => {
	const A = by(range(100), 2);
	const B = zip(range(0, 100, 2), range(1, 100, 2));

	t.deepEqual(list(A), list(B), 'compare to zip output');

	const C = by(range(4), 3);

	t.deepEqual(
		list(C),
		[
			[0, 1, 2],
			[3, undefined, undefined]
		],
		'n !| N'
	);

	const D = by('', 3);

	t.deepEqual(list(D), [], 'empty');
});

test('by (infinite sequences)', (t) => {
	const A = by(count(), 2);
	const B = zip(count(0, 2), count(1, 2));

	t.deepEqual(
		list(head(A, 1000)),
		list(head(B, 1000)),
		'compare to zip output'
	);
});