JavaScript parseInt() Function
 Complete Function Reference
Definition and Usage
The parseInt() function parses a string and returns an integer.
The radix parameter is used to specify which numeral system to be used, for
example, a radix of 16 (hexadecimal) indicates that the number in the string
should be parsed from a hexadecimal number to a decimal number.
If the radix parameter is omitted, JavaScript assumes the
following:
- If the string begins with "0x", the radix is 16 (hexadecimal)
- If the string begins with "0", the radix is 8 (octal). This
feature is deprecated
- If the string begins with any other value, the radix is 10 (decimal)
Syntax
| Parameter |
Description |
| string |
Required. The string to be parsed |
| radix |
Optional. A number (from 2 to 36) that represents the
numeral system to be used |
Tips and Notes
Note: Only the first number in the string is returned!
Note: Leading and trailing spaces are allowed.
Note: If the first character cannot be converted to a number,
parseInt() returns NaN.
Example
In this example we will use parseInt() to parse different strings:
<script type="text/javascript">
document.write(parseInt("10") + "<br />");
document.write(parseInt("10.00") + "<br />");
document.write(parseInt("10.33") + "<br />");
document.write(parseInt("34 45 66") + "<br />");
document.write(parseInt(" 60 ") + "<br />");
document.write(parseInt("40 years") + "<br />");
document.write(parseInt("He was 40") + "<br />");
document.write("<br />");
document.write(parseInt("10")+ "<br />");
document.write(parseInt("10",10)+ "<br />");
document.write(parseInt("010")+ "<br />");
document.write(parseInt("10",8)+ "<br />");
document.write(parseInt("0x10")+ "<br />");
document.write(parseInt("10",16)+ "<br />");
</script>
|
The output of the code above will be:
10
10
10
34
60
40
NaN
10
10
8
8
16
16
|
Try it yourself »
|
Complete Function Reference
 |
W3Schools' Online Certification Program
The perfect solution for professionals who need to balance work, family, and career building.
More than 4000 certificates already issued!
|
The HTML Certificate documents your knowledge of HTML, XHTML, and CSS.
The JavaScript Certificate documents your knowledge of JavaScript and HTML DOM.
The XML Certificate documents your knowledge of XML, XML DOM and XSLT.
The ASP Certificate documents your knowledge of ASP, SQL, and ADO.
The PHP Certificate documents your knowledge of PHP and SQL (MySQL).
|
