Turn properties of object into a comma-separated list?

Question

I have an object like this:

var person = {
  name: \"John\",
  surname: \"Smith\",
  phone: \"253 689 4555\"
}

I want:

Answer 1

var arr = [
    {
        key_1: "A",
        key_2: "1"
    },
    {
        key_1: "B",
        key_2: "2"
    },
    {
        key_1: "C",
        key_2: "3"
    }
];

var CSVOf_arr = arr.map((item) => { return item.key_1 }).join(',')

console.log('Comma seprated values of arr', CSVOf_arr)

OUTPUT: A,B,C