BigInt.asIntN() - JavaScript 编辑

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

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.

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

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 2^width 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

Specification
ECMAScript (ECMA-262) The definition of 'BigInt.asIntN()' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• BigInt
• BigInt.asUintN()