Convert object to multidimensinal array

Question

I basically want to do this in reverse: Convert multidimensional array to object

So let's say I have an object like this:

{
 "6": {"10":{'id':0,'name':'player1'}},
 "7": {"5":{'id':1,'name':'player2'}}
}

How can I convert that into a legit array like this:

[
 null, 
 null, 
 null, 
 null, 
 null, 
 null, 
 [null, null, null, null, null, null, null, null, null, null, {'id':0,'name':'player1'}],
 [null, null, null, null, null, {'id':1,'name':'player2'}]
]

This is the code that I successfully used to convert it the other way around:

function populateFromArray(array) {
 var output = {};
 array.forEach(function(item, index) {
 if (!item) return;
 if (Array.isArray(item)) {
 output[index] = populateFromArray(item);
 } else {
 output[index] = item;
 }
 });
 return output;
}
console.log(populateFromArray(input));

• DamianoPantani: Numbers as attribute names isn't generally a greatest idea.
• J. Titus: Technically, it already is a legitimate array. obj[7][5] returns {id: 1, name: "player2"}. The only difference, I guess, is that instead of null all unregistered array positions are undefined.
• Forivin: Well I want to loop through the thing without getting errors or checking for undefined. Atm obj[0][0] would through an error, wouldn't it?
• J. Titus: @Forivin: Yes, because obj[0] is undefined, so it has no first element.
• Andreas: obj[0][0] would also throw an error with your new structure

Answer 1

function objectToArray(obj) {
 var len = Math.max.apply(null, Object.keys(obj));
 if (len !== len) return obj; // checking if NaN
 var output = [];
 for (var i = 0; i <= len; i++) {
 output[i] = null;
 if (obj[i]) { 
 output[i] = objectToArray(obj[i]);
 }
 }
 return output;
}

Answer 2

var obj = {
 "6": {"10":{'id':0,'name':'player1'}},
 "7": {"5":{'id':1,'name':'player2'}}
};
function populateArray(obj) {
 var range = 0,
 arr = [];
 for (var index in obj) {
 range = Math.max(parseInt(index), range); 
 }
 for (var i = 0; i <= range; i++) {
 if (obj[i+'']) {
 arr[i] = populateArray(obj[i+'']);
 } else {
 arr[i] = null;
 }
 }
 return arr;
}
console.log(populateArray(obj))

Answer 3

Based on your other question, assuming the source is json, you can use a revive function as well to convert the data directly when parsing

var json = '{ "6": {"10":{"id":0, "name":"player1"}}, "7": {"5":{"id":1,"name":"player2"}}}';
function reviver(key,val){	
	if(isNaN(key) || val.id !== undefined)
 	return val;
 var res = [];
 for(var p in val)
 res[p] = val[p];
 return res;
}
var gameField = JSON.parse(json, reviver);
console.log(gameField);