Метод: Array.map()
Пример:

const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map((num) => num * 2);
console.log(doubled); // Output: [2, 4, 6, 8, 10]

Метод: String.toLowerCase()
Пример:

const message = "Hello, World!";
const lowercaseMessage = message.toLowerCase();
console.log(lowercaseMessage); // Output: "hello, world!"

Метод: Object.keys()
Пример:

const person = {
 name: "John",
 age: 25,
 occupation: "Developer"
};
const keys = Object.keys(person);
console.log(keys); // Output: ["name", "age", "occupation"]

Метод: Promise.all()
Пример:

const promise1 = Promise.resolve("Hello");
const promise2 = Promise.resolve("World");
const promises = [promise1, promise2];
Promise.all(promises)
 .then((results) => {
   console.log(results); // Output: ["Hello", "World"]
 })
 .catch((error) => {
   console.error(error);
 });

Метод: Array.filter()
Пример:

const numbers = [1, 2, 3, 4, 5];
const evenNumbers = numbers.filter((num) => num % 2 === 0);
console.log(evenNumbers); // Output: [2, 4]