VK API: Parse json Args to array.

gistfile1.js

var myList = Args.post_id_array_str;
// List should end with separator, for exampe ","
// car myList =  111,222,333,444,

var listSeparator = ",";
var listItemsType = "integer";
var result = [];
var charsLength = myList.length;
var currentPosition = 0;
var previousSeparatorPosition = -1;
var item;

while (currentPosition < charsLength) {
 if (myList.substr(currentPosition, 1) == listSeparator) {
  item = myList.substr(previousSeparatorPosition + 1, currentPosition - previousSeparatorPosition - 1);
  if (listItemsType == "integer") {
   item = parseInt(item);
  }
  result.push(item);
  previousSeparatorPosition = currentPosition;
 }
 currentPosition = currentPosition + 1;
}

var posts = result;