Number.parseInt()
The Number.parseInt()
method parses a string argument and
returns an integer of the specified radix or base.
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
BCD tables only load in the browser
See also
- Polyfill of
Number.parseInt
incore-js
- The
Number
object it belongs to. - The global
parseInt()
method.