toFixed() doesn't seem to work... why?

Life happened so I put my project to the side for a couple of months. I decided to pick the project back up today and updated the firmware on the Espruino. By the way I really like the new GUI of the IDE :-)

The issue I am having is toFixed(2) doesn't seem to get the decimal place to only two decimal places. toFixed(2) seemed to work before I took a break from my project.

I hit the Send to Espruino button. I get the following output.

_____ _ | |_ ___ ___ _ ||___ ___ | |_
-| . | _| | | | | . | ||| || |_|||_|_|

      |_| http://espruino.com  1v64 Copyright 2014 G.Williams

echo(0);
80.6646153846153879385383334010839462280­2734375 0
161.403076923076923776534385979175567626­953125 1
241.993846153846163815615000203251838684­08203125 2
322.732307692307699653611052781343460083­0078125 3
403.544615384615383391064824536442756652­83203125 4
484.209230769230771329603157937526702880­859375 5
564.833629007477156847016885876655578613­28125 6
645.498244392092601628974080085754394531­25 7
726.089013622861784824635833501815795898­4375 8
806.622811603695026860805228352546691894­53125 9 Temp: 80.6622811603695026860805228352546691894­53125
=undefined

CODE:

function onInit() {

  function getResTempValue(x) {
    var temp=0;
    var avgTemp=0;
    for (var i=0;i<x;i++)
    {
      var vOut = E.getAnalogVRef() * analogRead(A0); // if you attached VOUT to Ao
      var vZero = 0.4;
      var tCoeff =  19.5 / 1000;
      var tempinc = (vOut - vZero) / tCoeff;
      var tempinf = tempinc * (9 / 5) + 32;
      temp = temp + tempinf;
      console.log(temp);
      console.log(i);
    }
    temp = temp / x;
    temp.toFixed(2);  //<-- Doesn't seem to work.

    console.log("Temp: " + temp);
    return temp;
  }

  getResTempValue(10);
}

onInit();

Number.toFixed() returns a string with the specified format.

What you would want to do is:

var tfixed = temp.toFixed(2);  
    console.log("Temp: " + tfixed);
    return temp; //we probably want to return the number, not a string

or

    console.log("Temp: " + temp.toFixed(2));
    return temp;

Thanks @DrAzzy

As far as I'm aware that's never worked, so I'm not quite sure why everything was fine for you before!

DrAzzy, thanks for your help. Gordon, your right the code never worked. Which explains why I was getting erratic values from my sensor readings. Now, my sensor readings are stable.

Code that works:

function onInit() {
  var cmd="";
  Serial1.setup(9600/*baud*/);
  Serial1.onData(function (e) {
    console.log("RX Data: " + e.data);
  });

  function getResTempValue(x) {
    var temp=0;
    var avgTemp=0;
    var tfixed=0;

    for (var i=0;i<x;i++)
    {
      var vOut = E.getAnalogVRef() * analogRead(A0); // if you attached VOUT to Ao
      var vZero = 0.4;
      var tCoeff =  19.5 / 1000;
      var tempinc = (vOut - vZero) / tCoeff;
      var tempinf = tempinc * (9 / 5) + 32;
      temp = temp + tempinf;
      console.log(temp);
      console.log(i);
    }
    temp = temp / x;
    tfixed = temp.toFixed(2);

    console.log("Temp: " + tfixed);
    return temp;
  }

  getResTempValue(10);
}

onInit();