Fix the selection sorted by start — find the bug

const meetings = [[1, 10], [2, 3], [4, 5]];
meetings.sort((a, b) => a[0] - b[0]);
let count = 0, endsAt = -Infinity;
for (const [from, to] of meetings) if (from >= endsAt) { count++; endsAt = to; }
document.querySelector('#out').textContent = "attend " + count;