Reposted by Ruben Bridgewater | Node.js
ECMAScript excitement 😉
Congrats to Dan Minor @mozilla.org on advancing the Upsert proposal to Stage 4 at TC39 today 🎉
let map = new Map();
map.getOrInsert(key, defaultVal);
It lets you set a default value on a map key without overwriting an existing value 👍
![const a = [1, 2, 3];
a.description = "coords";
Object.defineProperty(a, "secret", {
value: true,
enumerable: false,
});
a[5] = 42;
Object.getNonIndexStringProperties(a);
// ["description"] ("secret" is non‑enumerable)
Object.getNonIndexStringProperties({ foo: 1, bar: 2 });
// ["foo", "bar"] (works on any object)](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:w227epg3attqnssfdkx6ex6a/bafkreihfvy2rjdam23xjyojvzrzhmh2afqpjqnude6g547hvjo2wi5vbru)
