Converting JavaScript object with numeric keys into array

I have an object like this coming back as a JSON response from the server:

{
  "0": "1",
  "1": "2",
  "2": "3",
  "3": "4"
}

I want to convert it into a JavaScript array like this:

["1","2","3","4"]

Is there a best way to do this? Wherever I am reading, people are using complex logic using loops. So are there alternative methods to doing this?

Solution 1:

It's actually very straight forward with jQuery's $.map

var arr = $.map(obj, function(el) { return el });

FIDDLE

and almost as easy without jQuery as well, converting the keys to an array and then mapping back the values with Array.map

var arr = Object.keys(obj).map(function(k) { return obj[k] });

FIDDLE

That's assuming it's already parsed as a javascript object, and isn't actually JSON, which is a string format, in that case a run through JSON.parse would be necessary as well.

In ES2015 there's Object.values to the rescue, which makes this a breeze

var arr = Object.values(obj);

Solution 2:

var json = '{"0":"1","1":"2","2":"3","3":"4"}';

var parsed = JSON.parse(json);

var arr = [];

for (var x in parsed) {
  arr.push(parsed[x]);
}

console.log(arr)

Hope this is what you're after!

Solution 3:

You simply do it like

var data = {
    "0": "1",
    "1": "2",
    "2": "3",
    "3": "4"
};

var arr = [];
for (var prop in data) {
    arr.push(data[prop]);
}

console.log(arr);

DEMO