const obj = {
id: 383912,
name: "Albus Dumbledore",
academicrank: "Professor"
};
Object.keys(obj).forEach((key, index) => {
obj[key] = obj[key] + '-' + index;
});
console.log(obj);
/*
run:
{
academicrank: "Professor-2",
id: "383912-0",
name: "Albus Dumbledore-1"
}
*/