My object in javascript not returning the wanted value

Question

I can't seem to figure out how to do the object part, I need to make it calculate the age dynamically. I've written most of the stuff here and it works fine the only down side is my dynamic age calculation, I don't know what I'm doing wrong and can't find my mistake.

<html>
    <head>
        <title>WEB PROGRAMIRANJE</title>
    </head>
    <body>
        <script type="text/javascript">
        var niza=new Array (9,8,7,6,5,4,3,2,1);
        var izbrisani=niza.shift();
        var izbrisanip=niza.pop();
        var sortirani=niza.sort();
       // form an arrey delete first and last:
       // sort the arrey:
        document.write(sortirani);  

        function babati(a,b,c)
        {
            var total;
            total=(a+b+c)/3;
            alert(total);
        }
        document.write("<br>");
        </script>
                <input type="button" value="Call" onClick="babati(0,5,10)";>
                <script type="text/javascript">
                document.write("<br>");
                var ucenik=new Object();
        // giving them value to object elements:
        ucenik.ime="Name";
        ucenik.prezime="Surname";
        ucenik.godina=2021;
        ucenik.roden=2003;
        // printing the object elements:
        document.write(ucenik.ime);
        document.write("<br>");
        document.write(ucenik.prezime);
        document.write("<br>");
        document.write(ucenik.roden);
        document.write("<br>");
        // The function:
        // This will calculate the age dinamicly This year - Birth year:
        ucenik.vozrast=function()
        {
            this.godina - this.roden;   
        }
        ucenik.vozrast();
        document.write(ucenik.vozrast);
         //This line above prints the dynamic age:
        </script>
    </body>
</html>

benjababe · Accepted Answer · 2021-12-14 17:14:28Z

1

2 things.

Firstly, the function isn't returning any value so running it won't result in any output.

Secondly, in the document.write(ucenik.vozrast) it writes the function definition rather than running the function and writing the output.

Below is the fixed code.

ucenik.vozrast=function()
{
    return this.godina - this.roden;   
}
document.write(ucenik.vozrast());

answered Dec 14, 2021 at 17:14

benjababe

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2 Comments

Snejp Over a year ago

Thanks for contributing, i managed to fix it

Snejp Over a year ago

I fixed check the comments below thanks

Joelnbl · Accepted Answer · 2021-12-14 17:21:37Z

1

first step you need to return your function expression. Something like this:

 ucenik.vozrast= function() {
    return this.godina - this.roden;
  }

and when you want to paint that result in the DOM you can do something like this

  let actualYears = ucenik.vozrast()
  document.write(actualYears);

edited Dec 14, 2021 at 17:21

answered Dec 14, 2021 at 17:14

Joelnbl

364 bronze badges

1 Comment

Snejp Over a year ago

I managed to fix it i was taking 2 diffrent names and i didnt notice that thanks for contributing. The method i used: ucenik.vozrast=function() { this.vozrast=2021-this.roden; } ucenik.vozrast(); document.write(ucenik.vozrast);

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