Web/JavaScript/Reference/Global objects/BigInt/asUintN

The BigInt.asUintN static method is used to wrap a BigInt value to an unsigned integer between 0 and 2^width-1.

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Syntax

BigInt.asUintN(width, bigint);

Parameters

width

The amount of bits available for the integer size.

bigint

The integer to clamp to fit into the supplied bits.

Returns

The value of bigint modulo 2^width as an unsigned integer.

Examples

Staying in 64-bit ranges

The BigInt.asUintN() method can be useful to stay in the range of 64-bit arithmetic.

const max = 2n ** 64n - 1n;

BigInt.asUintN(64, max);
// ↪ 18446744073709551615n

BigInt.asUintN(64, max + 1n);
// ↪ 0n
// zero because of overflow

Specifications

Specification
ECMAScript (ECMA-262)The definition of 'BigInt.asUintN()' 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.

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
asUintN	Chrome Full support 67	Edge Full support 79	Firefox Full support 68	IE No support No	Opera Full support 54	Safari Full support 14	WebView Android Full support 67	Chrome Android Full support 67	Firefox Android Full support 68	Opera Android Full support 48	Safari iOS Full support 14	Samsung Internet Android Full support 9.0	nodejs Full support 10.4.0

Legend

Full support  

Full support

No support  

No support

See also

• BigInt
• BigInt.asIntN()

BigInt.asUintN() by Mozilla Contributors is licensed under CC-BY-SA 2.5.