This project is part of the @thi.ng/umbrella monorepo.
1D / 2D bit field implementations.
All implementations are backed by typed arrays. Due to Uint32Array
backing the width is always rounded to a multiple of 32.
STABLE - used in production
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- @thi.ng/adjacency - Sparse & bitwise adjacency matrices and related functions for directed & undirected graphs
yarn add @thi.ng/bitfieldES module import:
<script type="module" src="https://cdn.skypack.dev/@thi.ng/bitfield"></script>For Node.js REPL:
# with flag only for < v16
node --experimental-repl-await
> const bitfield = await import("@thi.ng/bitfield");
Package sizes (gzipped, pre-treeshake): ESM: 1.22 KB
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
// 00000001000000000000000000000000Karsten Schmidt
If this project contributes to an academic publication, please cite it as:
@misc{thing-bitfield,
title = "@thi.ng/bitfield",
author = "Karsten Schmidt",
note = "https://thi.ng/bitfield",
year = 2016
}© 2016 - 2021 Karsten Schmidt // Apache Software License 2.0