Estaba leyendo este excelente artículo en Frontend Masters donde se describen algunas de las nuevas características presentes en Javascript y otras más que se esperan para este año o finales del mismo, entre ellas las que más destaco son las siguientes:

Iterator.from:

const result = Iterator.from(array)
  .map(x => x * 2)
  .filter(x => x > 10)
  .take(3)
  .toArray(); // No new arrays created, computation stops after 3

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Métodos en Set:

const youKnow  = new Set(["JS", "Python", "CSS", "SQL"]);
const jobNeeds  = new Set(["JS", "TypeScript", "Python"]);

// Skills the job wants that you already have
youKnow.intersection(jobNeeds); // → Set {"JS", "Python"}

// Everything combined — your full stack + job needs
youKnow.union(jobNeeds); // → Set {"JS", "Python", "CSS", "SQL", "TypeScript"}

// What the job needs that you DON'T know yet (skill gaps)
jobNeeds.difference(youKnow); // → Set {"TypeScript"}

// Skills you have that the job doesn't care about
youKnow.difference(jobNeeds); // → Set {"CSS", "SQL"}

// Skills that appear in only one set, not both
youKnow.symmetricDifference(jobNeeds); // → Set {"CSS", "SQL", "TypeScript"}

// Are all job requirements a subset of what you know?
jobNeeds.isSubsetOf(youKnow); // → false

// Do you have every skill and more?
youKnow.isSupersetOf(jobNeeds); // → false

// Do you and the job have zero overlap?
youKnow.isDisjointFrom(jobNeeds); // → false

---

Promise.try:

Promise.try(() => loadUser(id))
  .then(user  => render(user))
  .catch(err  => showError(err));  

---

Import attributes: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import/with

import data from "./file.json" with { type: 'json' }

import exampleStyles from "https://example.com/example_styles.css" with { type: "css" };

document.adoptedStyleSheets.push(exampleStyles);

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using y await using: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/using

class FileHandle {
  constructor(path) {
    this.path = path;
    console.log(`Opened ${path}`);
  }

  async write(data) {
    // ... write data
  }

  async [Symbol.asyncDispose]() {
    await someFlushOperation();
    console.log(`Flushed and closed ${this.path}`);
  }
}

async function saveData() {
  await using file = new FileHandle("output.txt");
  await file.write("hello world");
  // file is automatically flushed + closed here, even if an error is thrown
}

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Array.fromAsync: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fromAsync

function createAsyncIter() {
  let i = 0;
  return {
    [Symbol.asyncIterator]() {
      return {
        async next() {
          if (i > 2) return { done: true };
          i++;
          return { value: Promise.resolve(i), done: false };
        },
      };
    },
  };
}

Array.fromAsync(createAsyncIter()).then((array) => console.log(array));

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Intl.Collator:

const words = ['äpfel', 'Zebra', 'Bär', 'Apfel', 'über'];
const collator = new Intl.Collator('de');

const sorted = words.sort(collator.compare);
console.log(sorted); // ['Apfel', 'äpfel', 'Bär', 'über', 'Zebra']