The Number.parseInt()
method parses a string argument and returns an integer of the specified radix or base.
Number.parseInt()
Try it
Syntax
Number.parseInt(string) Number.parseInt(string, radix)
Parameters
-
string
-
The value to parse. If this argument is not a string, then it is converted to one using the
ToString
abstract operation. Leading whitespace in this argument is ignored. -
radix
Optional -
An integer between
2
and36
that represents the radix (the base in mathematical numeral systems) of thestring
.If
radix
is undefined or0
, it is assumed to be10
except when the number begins with the code unit pairs0x
or0X
, in which case a radix of16
is assumed.
Return value
An integer parsed from the given string
.
If the radix
is smaller than 2
or bigger than 36
, 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 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.
Specifications
Specification |
---|
ECMAScript Language Specification # sec-number.parseint |
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
parseInt |
34
|
12
|
25
|
No
|
21
|
9
|
≤37
|
34
|
25
|
21
|
9
|
2.0
|
1.0
|
0.12.0
|
See also
- Polyfill of
Number.parseInt
incore-js
- The
Number
object it belongs to. - The global
parseInt()
method.
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseInt