jquery - Javascript Error - Undefined -

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i trying create format graph. when try getting undefined console.log before data. here's code

$(document).ready(function () {     var graphdata = new array();     $.getjson("ds/js.json", function (data) {         datalength = returneddata.data.length;         var x = new array();         var y = new array();         var mytext, dataa, f;         (i = 0; < datalength; i++) {             x[i] = data.data[i].avgprice;             y[i] = data.data[i].numproducts;         }         (var = 0; < 6; a++) {             mytext = "x:" + x[a] + "," + "y:" + y[a] + "}" + "," + "{";             dataa = dataa + mytext;         }         console.log(dataa);         var f =             "[{data : [{" + dataa;         console.log(f);     });     drawgraph(graphdata); });

console output :

undefinedx:87.6,y:85},{x:116.08,y:61},{x:113.11,y:49},{x:181.37,y:65},{x:138.14,y:74},{x:66.03,y:89},x:66.03,y:89},{

what doing wrong here? , want separate format a=5, stops ", {" coming @ end.

you shouldn't building object through string concatenation that. i'd recommend building array of objects so:

var dataa = []; (var = 0; < 6; a++) {     var newobj = {x: + x[a], y: + y[a]};     dataa.push(newobj); }

and generate f have:

var f = json.stringify([{data: dataa}]);

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