I am receiving undefined when using charAt[i]

doh! I used brackets instead of parentheses. data.charAt(i); works.

Code:

s7s.prototype.sendValue = function (data) {
  var a = this.address;
  var clr = this.displayTable.Clear; //Display clear command
  var dpc = this.displayTable.dp.cmd; //Decimal point command
  var dplo = this.displayTable.dp.location; //Decimal point location map

  var i;
  var length = data.length;
  var dpLoc;
  var value = "";

  for(i=0; i<length; i++) {
    var char = data.charAt(i);

    if(char != ".") {
      value += char;
    }

    if(char == ".") {
      dpLoc = i;
    }
  }

  I2C1.writeTo(a, clr); //Clear display
  I2C1.writeTo(a, value);

  if(typeof dpLoc !== 'undefined') {
    I2C1.writeTo(a, dpc);
    I2C1.writeTo(a, dplo[dpLoc - 1]);
  }
};