Object.fromEntries()

Object.fromEntries(iterable);

const map = new Map([
    ['foo', 'bar'],
    ['baz', 42]
]);
const obj = Object.fromEntries(map);
console.log(obj); // { foo: "bar", baz: 42 }

const arr = [
    ['0', 'a'],
    ['1', 'b'],
    ['2', 'c']
];
const obj = Object.fromEntries(arr);
console.log(obj); // { 0: "a", 1: "b", 2: "c" }

const object1 = {
    a: 1,
    b: 2,
    c: 3
};
const object2 = Object.fromEntries(
    Object.entries(object1)
    .map(([key, val]) => [key, val * 2])
);
console.log(object2);
// { a: 2, b: 4, c: 6 }