Javascript Array Object Property Undefined -

when attempt access array object (preivous_data) console outputs this:

[object { label="line1", data=[13]}] 

as expected. however, when access array object property (preivous_data.data) console gives undefined. confused - error making not display array values property data in object?

as further test, converted object json.stringify, javascript object. again found same issues accessing property value of object:

function dataupdate(passed_ondatareceived_data){        console.log("passed object")                     // console output:  passed object        preivous_data = passed_ondatareceived_data       console.log(preivous_data)                       // console output: [object { label="line1", data=[13]}]       console.log(preivous_data.data)                  // console output: undefined        var json_stringify = json.stringify(preivous_data);       console.log(json_stringify)                     // console output:[{"label":"line1","data":[[0,88],[1,28],[2,52],[3,7],[4,93],[5,78],[6,53],[7,64],[8,43],[9,77],[10,58],[11,74],[12,5]]}]       var myobject = eval('(' + json_stringify + ')')       console.log(myobject)                           // console output: [object { label="line1", data=[13]}]       console.log(myobject.data)                      // console output: undefined } 

any appreciated.

looks have object previous_data array.

[object { label="line1", data=[13]}] 

so need previous_data[0].data access data attribute.