cmath-js

Implementation of parts of C++'s numerics libraries in TypeScript/JavaScript, including functions C++ inherits from C.

Floating-point functions

Integer functions

These functions accept either a bigint or an integer number:

abs
bit_ceil
bit_floor
bit_width

countl_one as create_countl_one, which is used this way:

import { create_countl_one } from "cmath-js";
const countl_one_u16 = create_countl_one({ bits: 16 });
const integer = 0xf0_00;
// Prints "1111000000000000 has 4 leading one bits."
console.log(
    `${integer.toString(2).padStart(16, "0")} has ${countl_one_u16(integer)} leading one bits.`,
);

countl_zero as create_countl_zero
countr_one as create_countr_one
countr_zero as create_countr_zero
div

gcd. Example:

import { gcd } from "cmath-js";
// Prints "The greatest common divisor of 24 and 32 is 8."
console.log(`The greatest common divisor of 24 and 32 is ${gcd(24, 32)}.`);

has_single_bit
lcm
popcount

Functions for both floats and ints

Mathematical constants

Constants in the std::numbers namespace are available from the numbers subpath export. Example:

import { sqrt3 } from "cmath-js/numbers";
console.log(`The square root of 3 is ${sqrt3}.`);

Test coverage

The test coverage is a perfect 100% and enforced by the publishing and pull request verification workflows.

Contributing

Contributions are welcome! See CONTRIBUTING.md