jquery - Javascript: access an object property whose name starts with a number -

i'm creating javascript / jquery application.

i need process json response represents hashmap, this:

  {     "accounts": {       "mediafire": {        "provider": "mediafire",        "usedstorage": "779680",        "totalstorage": "53687091200"       },       "4sync": {        "provider": "4sync",        "usedstorage": "620692",        "totalstorage": "16106127360"       }     }   } 

i use pasing function (which can't control), returns parsed json response in object result.

when try access 4sync this:

var usedstorage = result.accounts.4sync.usedstorage; //doesn't work 

it doesn't work, think it's because of 4 @ beginning... same operation other object works fine:

var usedstorage = result.accounts.mediafire.usedstorage; //works 

i know result object contains object 4sync, can't access it. here screenshot of chrome's console:

is there workaround solve this?

use square brackets:

var usedstorage = result.accounts["4sync"].usedstorage; 

property identifers can begin number, member expressions . character allow valid variable identifiers (since else ambiguous). around this, can use square bracket syntax, equivalent allows use of string.

if you're interested, here the grammar:

memberexpression :
    primaryexpression
    functionexpression
    memberexpression [ expression ]
    memberexpression . identifiername

notice how square brackets can contain expression, . can followed identifiername (basically, valid identifier, plus reserved words in es5).