JavaScript Number.parseInt()
Examples
Number.parseInt("10");
Number.parseInt("10.00");
Number.parseInt("10.33");
Number.parseInt("34 45 66");
Number.parseInt(" 60 ");
Number.parseInt("40 years");
Number.parseInt("He was 40");
Try it Yourself »
Number.parseInt("10", 10);
Number.parseInt("010");
Number.parseInt("10", 8);
Number.parseInt("0x10");
Number.parseInt("10", 16);
Try it Yourself »
Definition and Usage
The Number.parseInt method parses a value as a string and returns the first integer.
A radix parameter specifies the number system to use:
2 = binary, 8 = octal, 10 = decimal, 16 = hexadecimal.
If radix is omitted, JavaScript assumes radix 10. If the value begins with "0x", JavaScript assumes radix 16.
Notes
If the first character cannot be converted, NaN is returned.
Leading and trailing spaces are ignored.
Only the first integer found is returned.
Syntax
Number.parseInt(string, radix)
Parameters
| Parameter | Description |
| value | Required. The value to be parsed. |
| radix | Optional. Default is 10. A number (2 to 36) specifying the number system. |
Return Value
| Type | Description |
| Number | NaN if no integer is found. |
Browser Support
Number.parseInt() is an ECMAScript6 (ES6) feature.
ES6 (JavaScript 2015) is supported in all modern browsers:
| Chrome | Edge | Firefox | Safari | Opera |
| Yes | Yes | Yes | Yes | Yes |
Number.parseInt() is not supported in Internet Explorer 11 (or earlier).
