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extra-bit

1.0.4
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  • License MIT

The bit is a basic unit of information in information theory, computing.

Package Exports

  • extra-bit

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (extra-bit) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

The bit is a basic unit of information in information theory, computing. This package includes a number of very interesting bit twiddling hacks by Sean Eron Anderson and many others.

Each method is also available as separate package for use by bundling tools, like browserify, rollup, uglify-js.

Stability: Experimental.

const bit = require('extra-bit');

bit.count(7);
// 3 (111 => 3)

bit.parity(8, 2);
// 2 (10,00 => 10)

bit.swap(6, 1, 0);
// 5 (110 => 101)

bit.reverse(0xFFFF0000);
// 65535 (0xFFFF0000 => 0x0000FFFF)

bit.signExtend(15, 4);
// -1

reference

Method Action
get Gets a bit (right-shift method).
set Sets a bit (left-shift method).
setAs Sets bits as per mask (not method).
swap Swaps bit sequences (xor method).
scan Gets index of first set bit from LSB (mod37 method).
scanReverse Gets index of first set bit from MSB (DeBruijn method).
count Counts bits set (parallel method).
parity Gets n-bit parity.
reverse Reverses all bits (parallel method).
merge Merges bits as per mask (xor method).
interleave Interleaves bits of two int16s (binary magic method).
signExtend Sign extends variable bit-width integer.

nodef

Browserified, minified version of this package is extra-bit.min.