BigInt.asUintN()

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

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 2width 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 Status
ECMAScript Latest Draft (ECMA-262)
The definition of 'BigInt.asUintN()' in that specification.
Draft

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
asUintNChrome Full support 67Edge No support NoFirefox Full support 68IE No support NoOpera Full support 54Safari No support NoWebView Android Full support 67Chrome Android Full support 67Firefox Android Full support 68Opera Android Full support 48Safari iOS No support NoSamsung Internet Android Full support 9.0nodejs Full support 10.4.0

Legend

Full support  
Full support
No support  
No support

See also