javascript - parseInt doesn't work well in a loop -

arr = ["1","2"];  $.each(arr,function(i,obj){                 sum += parseint(obj); }); console.log(sum); 

i expect sum 3 result 12? thought parseint did job? what's wrong here?

the difference in behavior on how initializing sum

if var sum = 0; -> result expected i.e. 3  if var sum = ""; -> result 12 coming because sum string