The Number.parseInt() method parses a string argument and returns an integer of the specified radix or base.
Syntax
Number.parseInt(string,[ radix ])
Parameters
string- The value to parse. If the
stringargument is not a string, then it is converted to a string (using theToStringabstract operation). Leading whitespace in the string argument is ignored. radix- An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the above mentioned string. Specify
10for the decimal numeral system commonly used by humans. Always specify this parameter to eliminate reader confusion and to guarantee predictable behavior. Different implementations produce different results when a radix is not specified, usually defaulting the value to 10.
Return value
An integer number parsed from the given string. If the first character cannot be converted to a number, NaN is returned.
Description
This method has the same functionality as the global parseInt() function:
Number.parseInt === parseInt; // true
and is part of ECMAScript 2015 (its purpose is modularization of globals). Please see parseInt() for more detail and examples.
Polyfill
if (Number.parseInt === undefined)
Number.parseInt = window.parseInt;
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Number.parseInt' in that specification. |
Standard | Initial definition. |
| ECMAScript Latest Draft (ECMA-262) The definition of 'Number.parseInt' in that specification. |
Living Standard |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | 25 | No | (Yes) | 9 |
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | 25 | No | (Yes) | 9 |
See also
- The
Numberobject it belongs to. - The global
parseInt()method.
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