How to convert a associative array into a sorted string array?

Question

How can I convert this js object

 var obj1 =  {"user1":28, "user2":87, "user3":56};

into a string array, sorted by value, like so:

["user2","user3","user1"]

Answer 1

Use this:

var obj1 =  {"user1":28, "user2":87, "user3":56};
var a = Object.keys(obj1).sort(function(x,y){return obj1[y]-obj1[x]})
console.log(a);

Output:

["user2", "user3", "user1"]