@thi.ng/bitfield

@thi.ng/bitfield

This project is part of the @thi.ng/umbrella monorepo.

• About
• Installation
• Dependencies
• Usage examples
• Authors
• License

About

Typed array backed 1D / 2D bit field / bit matrix implementations. Due to Uint32Array backing, width is always a multiple of 32.

Installation

yarn add @thi.ng/bitfield

Dependencies

• @thi.ng/binary
• @thi.ng/strings

Usage examples

import { BitField, BitMatrix } from "@thi.ng/bitfield";

// size always rounded up to a multiple of 32
const field = new BitField(16);

field.setAt(0);

// if 2nd arg is false, the bit will be cleared
// setAt returns non-zero value if bit was previously set
field.setAt(31, true);
// 0

// returns non-zero value if bit is set
field.at(0)
// -2147483648

field.at(1)
// 0

field.toString();
// 10000000000000000000000000000001

field.resize(64)
// 1000000000000000000000000000000100000000000000000000000000000000

const mat = new BitMatrix(8, 32);
for(let i = 0; i < 8; i++) mat.setAt(i, i);

mat.at(7, 7);
// 16777216

mat.toString();
// 10000000000000000000000000000000
// 01000000000000000000000000000000
// 00100000000000000000000000000000
// 00010000000000000000000000000000
// 00001000000000000000000000000000
// 00000100000000000000000000000000
// 00000010000000000000000000000000
// 00000001000000000000000000000000

Authors

• Karsten Schmidt

License

© 2019 Karsten Schmidt // Apache Software License 2.0