Number.parseInt()
BaselineWidely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.
TheNumber.parseInt() static method parses a string argument andreturns an integer of the specified radix or base.
Try it
function roughScale(x, base) { const parsed = Number.parseInt(x, base); if (Number.isNaN(parsed)) { return 0; } return parsed * 100;}console.log(roughScale(" 0xF", 16));// Expected output: 1500console.log(roughScale("321", 2));// Expected output: 0Syntax
Number.parseInt(string)Number.parseInt(string, radix)Parameters
stringThe value to parse,coerced to a string. Leading whitespace in this argument is ignored.
radixOptionalAn integer between
2and36that represents theradix (the base in mathematical numeral systems) of thestring.If
radixis undefined or0, it is assumed to be10except when the number begins with the code unit pairs0xor0X, in which case a radix of16is assumed.
Return value
An integer parsed from the givenstring.
If theradix is smaller than2 or bigger than36, or the first non-whitespace character cannot be converted to a number,NaN is returned.
Examples
Number.parseInt vs. parseInt
This method has the same functionality as the globalparseInt() function:
Number.parseInt === parseInt; // trueIts purpose is modularization of globals. Please seeparseInt() for more detail and examples.
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-number.parseint |