heap-data-structure/specification

import {tester} from '../tester.js';

export function _headreference(
    _test,
    length,
    heapname,
    makeHeap,
    diffname,
    diff,
    n,
) {
    const title = `Heap headreference (${heapname}, ${diffname}, ${n})`;

    _test(title, (t) => {
        const q = makeHeap(diff);
        const a = [];

        let i = n;
        while (i--) {
            const x = Math.random();
            q.push(x);
            a.push(x);
        }

        i = n;
        const b = [];

        while (i--) {
            b.push(q.headreference().value);
            q.pop();
        }

        a.sort(diff);

        t.deepEqual(b, a, 'check head reference sorted');
        t.deepEqual(q.headreference(), null, 'check head reference empty');
    });
}

export const headreference = tester(_headreference);