Javascript - Output return value of an object method

Question

Newbie alert. I'm new to JavaScript. Love it so far. I'm having a bit of a problem I hope someone can help me with:

Here's my script in a .js file:

function human(name, age, gender){
  this.name = name;
  this.age = age;
  this.gender = gender;
  this.yearsToRetirement = function(){                  
          return 65 - this.age;

  };
}


var Steve = new human('Steve', 34, 'Male');
document.write(Steve.name + "  " + Steve.age + "  " + Steve.gender + Steve.yearsToRetirement);

But here's my browser output:

Steve 34 Malefunction (){ return 65 - this.age; }

As you may have guessed, I'm looking for there to be a "31" where we see function (){ return 65 - this.age; }

...What gives?

Any help is MUCH appreciated.

yearsToRetirement is a method of an object, so you have to call it with Steve.yearsToRetirement() — halfzebra
– halfzebra, Commented Oct 2, 2015 at 16:46

manonthemat · Accepted Answer · 2015-10-02 16:42:08Z

1

As yearsToRetirement is a function you want to execute it. Try this

var Steve = new human('Steve', 34, 'Male');
document.write(Steve.name + " " + Steve.age + " " + Steve.gender + Steve.yearsToRetirement());

answered Oct 2, 2015 at 16:42

manonthemat

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Comments

Sherali Turdiyev · Accepted Answer · 2015-10-02 16:59:51Z

0

You can do it through getter. Then, Steve.yearsToRetirement works fine.

function human(name, age, gender){
  this.name = name;
  this.age = age;
  this.gender = gender;
  var _yearsToRetirement = 65 - this.age;
  Object.defineProperties(this, {
        yearsToRetirement: {
            get: function () {
                return 65 - this.age;
            },
            enumerable: true
        }
    });  
}


var Steve = new human('Steve', 34, 'Male');
document.write(Steve.name + "  " + Steve.age + "  " + Steve.gender + Steve.yearsToRetirement + "<br>");

Steve.age = 40;
document.write(Steve.name + "  " + Steve.age + "  " + Steve.gender + Steve.yearsToRetirement);

answered Oct 2, 2015 at 16:59

Sherali Turdiyev

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Comments

Lajos Arpad · Accepted Answer · 2015-10-02 18:33:53Z

0

You are getting yearsToRetirement as a function object here and not running it:

document.write(Steve.name + "  " + Steve.age + "  " + Steve.gender + Steve.yearsToRetirement);

Instead, you need to call the function, like this:

document.write(Steve.name + "  " + Steve.age + "  " + Steve.gender + Steve.yearsToRetirement());

answered Oct 2, 2015 at 18:33

Lajos Arpad

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