# Creating Number Objects Rather than Performing String-to-Number Conversions : Number Data Type « Language Basics « JavaScript DHTML

Creating Number Objects Rather than Performing String-to-Number Conversions

```
<html>
<script language="JavaScript1.1" type="text/javascript">
<!--
Number.prototype.description = null;

Highway = new Number(65);
City = new Number(35);
SchoolZone = new Number(25);

Highway.description = "Interstate Highway Speed Limit";
City.description = "City Speed Limit";
SchoolZone.description = "School Zone Speed Limit";

function tellDifference(num1, num2) {
diff = num1 - num2;
document.write("The speed difference between " + num1.description +
" and " + num2.description + " is " + diff);    }

//-->
</script>
<body>
<script language="JavaScript1.1" type="text/javascript">
<!--
// Call function
tellDifference(Highway,  City);
//-->
</script>
</body>
</html>

```

### Related examples in the same category

 1 Define variables, assign values and output 2 Dividing by Zero 3 Add Four Numbers from an HTML Form (and Display the Results) 4 Add characters 5 Complex class to represent complex numbers 6 A Function That Returns the Sum of Three Numbers (Stripped-Down Version) 7 Concatenating Variables and Displaying the Value Contained 8 JavaScript Loan Calculator 9 Factorials 10 Converting a Number to a String 11 Using toString() with Radix Values 12 Using JavaScript Integers 13 Conversion of Logical Values to Numeric Values 14 Using Floating-Point Numbers 15 Automatic Conversion between Types 16 Explicit Conversion Functions 17 Date Object Calculations 18 Operator Precedence and Different Data Types 19 Converting Base 10 to Base 16 Using Bitwise Operators 20 Number Calculation 21 Format a number 22 Format a number 2 23 Decimal to 2 Hex 24 Concatenate integer variable to a string variable