With Javascript use a for loop to sum numbers in an array [duplicate]

Question

I'm trying to find a way to sum all the numbers that have been added to an array. I believe this should work:

   var total = 0;

   for (var i  = 0; i < totalPrice.length; i++);

   total  += totalPrice[i];
   document.getElementById("displayPrice").innerHTML = total;

But total comes out as a NaN.

This is an example of my code in JSFiddle, if you add the item twice the value gets pushed into the array, what am I doing wrong with the for loop?

https://jsfiddle.net/bgv5s9re/2/

Typo: Remove the semicolon after the for(...); <---. That's an empty statement, which became the body of the loop. — user1106925
– user1106925, Commented Oct 8, 2016 at 15:51
You're welcome. And just FYI, you get NaN because i is out of bounds, so you're doing total += undefined, since out of bounds array access produces the undefined value. — user1106925
– user1106925, Commented Oct 8, 2016 at 15:53

ScaisEdge · Accepted Answer · 2016-10-08 15:59:44Z

5

You could use brackets

  var total = 0;

   for (var i  = 0; i < totalPrice.length; i++){

      total  += totalPrice[i];

   }
   document.getElementById("displayPrice").innerHTML = total;

edited Oct 8, 2016 at 15:59

answered Oct 8, 2016 at 15:54

ScaisEdge

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