iterable-iterator/cardinality

import le from './le.js';
import ge from './ge.js';

/**
 * Gele.
 *
 * @param {number} m
 * @param {number} n
 * @param {Iterable} iterable
 */
const gele = (m, n, iterable) => {
    if (n < m) return false;

    if (n < 0) return false;

    if (m <= 0) return le(n, iterable);

    if (n === Number.POSITIVE_INFINITY) return ge(m, iterable);

    if (iterable.length !== undefined)
        return m <= iterable.length && iterable.length <= n;

    if (iterable.size !== undefined)
        return m <= iterable.size && iterable.size <= n;

    const it = iterable[Symbol.iterator]();

    n -= m;

    for (; m > 0; --m) if (it.next().done) return false;
    for (; n > 0; --n) if (it.next().done) return true;

    return it.next().done;
};

export default gele;