Javascript: average which accept null values

avgNull.js

16 lines (14 sloc)  0.36 kB
function average(data) {
/*Can't find an average function in JS, made one
This function is able to handle null values!!!*/

  var count = null;
  var sum = null;
  for (i=0; i<data.length; i++) {
    if (data[i]) {
      count++;
      sum = sum + data[i];
    }
  }
  if (count) {var average = Number( sum / count)} else { average=null}
  return average;  
}