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BigInt.asIntN

The BigInt.asIntN static method is used to wrap a BigInt value to a signed integer between -2width-1 and 2width-1-1.

Syntax

BigInt.asIntN(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 a signed integer.

Examples

Staying in 64-bit ranges

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

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

BigInt.asIntN(64, max);
// ↪ 9223372036854775807n

BigInt.asIntN(64, max + 1n);
// ↪ -9223372036854775807n
// negative because of overflow

Specifications

Browser compatibilityUpdate compatibility data on GitHub

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

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/asIntN