how to translate an array in js code example

Example 1: javascript convert to array

console.log(Array.from('foo'));
// expected output: Array ["f", "o", "o"]

console.log(Array.from([1, 2, 3], x => x + x));
// expected output: Array [2, 4, 6]

Example 2: how to convert set to a string in js

[...foo].join(' ')