function (...args) {
    // ...
}

// 2022 or later
structuredClone(obj)

Object.keys(obj).length

const params = new URLSearchParams(window.location.search);
if (params.get("whatever") != null) {
    // ...
}

[1, 2, 3, ...theRest]

// sort numbers ascending
array.sort((a, b) => a - b);

// sort strings ascending
array.sort((a, b) => {
    if (a < b) {
        return -1;
    }

    if (a > b) {
        return 1;
    }

    return 0;
});

const map = new Map();
map.set(key, value);
map.get(value); // undefined if not found
const entries = Array.from(map.entries());

const today = new Date();
const yesterday = new Date(today);
yesterday.setDate(yesterday.getDate() - 1);

// WARNING: toISOString() converts from local time to UTC
function iso8601(d) {
    const mm = (d.getMonth() + 1 + "").padStart(2, "0");
    const dd = (d.getDate() + "").padStart(2, "0");
    return `${d.getFullYear()}-${mm}-${dd}`;
}