array creation via mapping function

arrayCreate.js

const obj = {
    length: 4,
    0: 'one',
    1: 'two',
    2: 'three',
};

console.log(Array.from(obj, (v, i) => {
    if (v === undefined) {
        return 'no element';
    } else {
        return v;
    }
}))