Some JavaScript functions that can significantly optimize the primitive approaches programmers might use for certain tasks:

reduce

const numbers = [10, 20, 30];
const sum = numbers.reduce((total, num) => total + num, 0);
console.log(sum); // 60

fromEntries

const obj = { a: 1, b: 2, c: 3 };
const transformed = Object.fromEntries(
  Object.entries(obj).map(([key, value]) => [key, value * 2])
);
console.log(transformed); // { a: 2, b: 4, c: 6 }

Find

const users = [{ id: 1 }, { id: 2 }, { id: 3 }];
const user = users.find(u => u.id === 2);
console.log(user); // { id: 2 }