javascript - Value of the variable becomes empty when accessed outside the function in node js -

i have following code :

for(var index in workload.elements) { var arr = []; var resourceidentifiers = {}; var elementinfo = {}; var metadatamodified = {};

        elementinfo = workload.elements[index];           arr[index] = workload.elements[index].uri;         if(workload.elements[index].parameters.imageuri)         {             arr.push(workload.elements[index].parameters.imageuri);         }         resourceidentifiers = arr.join(',');         console.log('uri' + resourceidentifiers);          // connects mysql , fetch data         mysql.elementlevelpricing(resourceidentifiers, function(result){          elementlevelpricingsummary = json.stringify(result,null,2);         console.log('resultin' + elementlevelpricingsummary);          });          console.log('resultout' + json.stringify(elementlevelpricingsummary,null,2))      } 

the value of variable elementlevelpricingsummary becomes empty {} when accessed outside called function mysql.elementlevelpricing().

the function passed mysql.elementlevelpricing asynchronous callback, running after console.log line below it. you'll want need data in callback itself.