const map = new Map();
map.set("key", undefined);
console.log(map.has("key"), map.get("key"));
Post #1898
7.07K
CHALLENGE ❓
- 👍 7
- Oct 12, 2026Post #3554
- Oct 12, 2026CHALLENGE const arr = [1, [2, 3], [4, [5, 6]]]; const a = arr.flat(); const b = arr.flat(I…
- Oct 11, 2026Post #3552
- Oct 11, 2026CHALLENGE const output = []; output.push(typeof foo); try { output.push(typeof bar); } cat…
- Oct 10, 2026Post #3550
- Oct 10, 2026CHALLENGE async function main() { const settled = await Promise.allSettled([ Promise.resol…