The toString()
method returns a string representing the specified BigInt
object. The trailing "n" is not part of the string.
The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
bigIntObj.toString([radix])
Parameters
radix
Optional- Optional. An integer in the range 2 through 36 specifying the base to use for representing numeric values.
Return value
A string representing the specified BigInt
object.
Exceptions
RangeError
- If
toString()
is given a radix less than 2 or greater than 36, aRangeError
is thrown.
Description
The BigInt
object overrides the toString()
method of the Object
object; it does not inherit Object.prototype.toString()
. For BigInt
objects, the toString()
method returns a string representation of the object in the specified radix.
The toString()
method parses its first argument, and attempts to return a string representation in the specified radix (base). For radixes above 10, the letters of the alphabet indicate numerals greater than 9. For example, for hexadecimal numbers (base 16) a
through f
are used.
If the radix
is not specified, the preferred radix is assumed to be 10.
If the bigIntObj
is negative, the sign is preserved. This is the case even if the radix is 2; the string returned is the positive binary representation of the bigIntObj
preceded by a -
sign, not the two's complement of the bigIntObj
.
Examples
Using toString
17n.toString(); // '17' 66n.toString(2); // '1000010' 254n.toString(16); // 'fe' -10n.toString(2); // -1010' -0xffn.toString(2); // '-11111111'
Negative-zero BigInt
There is no negative-zero BigInt
as there are no negative zeros in integers. -0.0
is an IEEE floating-point concept that only appears in the JavaScript Number
type.
(-0n).toString(); // '0' BigInt(-0).toString(); // '0'
Specifications
Specification |
---|
ECMAScript (ECMA-262) The definition of 'BigInt.prototype.toString()' in that specification. |
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.
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
toString | Chrome Full support 67 | Edge Full support 79 | Firefox Full support 68 | IE No support No | Opera Full support 54 | Safari No support No | WebView Android Full support 67 | Chrome Android Full support 67 | Firefox Android Full support 68 | Opera Android Full support 48 | Safari iOS No support No | Samsung Internet Android Full support 9.0 | nodejs Full support 10.4.0 |
Legend
- Full support
- Full support
- No support
- No support