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# Why do I recieve [object Object] answer in my CALCULATOR?

I just finished Object Oriented Java Script and trying to put it all together; What should I change? this is my code (it is from one exercise):

```JavaScript
var calculator = {
sum: 5,
add: function(value) {
this.sum += value;
},
subtract: function(value) {
this.sum -= value;
},
multiply: function(value) {
this.sum *= value;
},
divide: function(value) {
this.sum /= value;
},
clear: function() {
this.sum = 0;
},
equals: function() {
return this.sum;
}
}

calculator.add(5);
calculator.equals();
var display = calculator
alert(calculator);
```

## 2 Answers

Hi,

Let's write the code again and see why you're getting that message and what's the solution:

```var calculator = {
sum: 5,
add: function(value) {
this.sum += value;
},
subtract: function(value) {
this.sum -= value;
},
multiply: function(value) {
this.sum *= value;
},
divide: function(value) {
this.sum /= value;
},
clear: function() {
this.sum = 0;
},
equals: function() {
return this.sum;
}
}
```

Above code is simply a calculator object with a bunch of useful methods.

Now let's analyze your code :

```calculator.add(5); //This adds 5 to the sum , so after this sum will be 10.
calculator.equals(); //This returns the sum, but you didn't catch it in a variable
var display = calculator
alert(calculator);  //calculator is an object and with this line you're going to see "[Object object]" in alert dialog box
```

Let's see the solution:

```calculator.add(5); //This adds 5 to the sum , so after this sum will be 10.
var display = calculator.equals(); //equals() method returns sum "10"and we catch it in a variable called display.
alert(display);  //This will now show value of display variable "10" in an alert dialog box.
```

I hope it answers your question, Happy Coding !

• Zain