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JavaScript parseInt() Function
JavaScript Global Functions
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
parseInt(string, radix)
| 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 |
Browser Support
The parseInt() function is supported in all major browsers.
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.
Note: Older browsers will use the octal radix (8) as default when the string begins with "0". As of ECMAScript 5, the default is the decimal radix (10).
Example
Example
Parse different strings:
<script>
document.write(parseInt("10") + "<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",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>
document.write(parseInt("10") + "<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",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:
Try it yourself »
Note: Older browsers will result parseInt("010") as 8, because older versions of ECMAScript, (older than ECMAScript 5, uses the octal radix (8) as default when the string begins with "0". In ECMAScript 5, the default is the decimal radix (10).
JavaScript Global Functions
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