extra-bit - A collection of common bitwise operations

A collection of common bitwise operations.
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The bit is a basic unit of information in information theory, computing. This package includes bit twiddling hacks by Sean Eron Anderson and many others. JavaScript converts a Number (a 64-bit floating point number) to a 32-bit integer when bitwise operators (such as |) are applied. All bitwise operations are performed on 32-bit integers.

This package is available in Node.js and Web formats. The web format is exposed as extra_bit standalone variable and can be loaded from jsDelivr CDN.

Stability: Experimental.

```javascript const bit = require('extra-bit'); // import * as bit from "extra-bit"; // import * as bit from "https://unpkg.com/extra-bit/index.mjs"; (deno)

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 (0x0000FFFF)

bit.signExtend(15, 4); // → -1 ```

Index

| Property | Description | | ---- | ---- | | get | Get bits at specified index. | | getAs | Get bits as per mask. | | set | Set bits at specified index. | | setAs | Set bits as per mask. | | toggle | Toggle bits at specified index. | | toggleAs | Toggle bits as per mask. | | swap | Swap bit sequences at specified indices. | | scan | Find index of first set bit from LSB. | | scanReverse | Find index of first set bit from MSB. | | count | Count bits set. | | parity | Calculate n-bit parity. | | rotate | Rotate bits by a certain amount. | | reverse | Reverse all bits. | | merge | Merge bits as per mask. | | interleave | Interleave bits of two int16s. | | signExtend | Sign extend variable bit-width integer. |

- TypeScript
Published by wolfram77 almost 4 years ago