BitArray

BitArray is a simple bit array/bit field library in pure JavaScript

BitArray is based on the Ruby library BitArray by Peter Cooper (https://github.com/peterc/bitarray).

Basic, pure JavaScript bit field.

Installation

Server:

$ npm install bitarray

Client:

$ component install microjs/bitarray

Examples

Create a bit array 1000 bits wide:

var ba = new BitArray(1000);

Setting and reading bits:

ba.set(100, 1);
ba.get(100); // => 1

ba.set(100, 0);
ba.get(100); // => 0

Create a BitArray where all the bits default to 1:

var ba = new BitArray(100, 1);
ba.get(50); // => 1

toString:

var ba = new BitArray(20);
[1,3,5,9,11,13,15].forEach(function(i){ ba.set(i, 1) });
ba.toString(); // => "01010100010101010000"

Notes

The total_set method is not ported for now.

There might be bugs, this is just a quick port. Non-sucky tests would be awesome. hinthint (The test file from the original repo https://github.com/peterc/bitarray/blob/master/test/test_bitarray.rb should be ported.)

License

MIT licensed. Copyight 2012 Thomas Fuchs, yada yada. Original library: Copyright 2007-2012 Peter Cooper, yada yada.