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Simple, fast bit vectors for javascript. Useful in place of objects where performance is extremely important and your keys are all iteger convertible values)
Simple, fast bit vectors for javascript. Useful in place of object maps where performance is extremely important and your keys are all integers or integer convertible values that lie within a relatively narrow range.
$ npm install bit-vector
This package exports four functions:
createBv(sizeInBits)
- Creates a bit vector with the number of bits you want. Returns an array or typed array (depending on your environment) of length: Math.ceil(sizeInBits / 32)
.setBit(bv, idx)
- Set the bit at idx
position in the vectorclearBit(bv, idx)
- Clear the bit at idx
position in the vectorgetBit(bv, idx)
- Retrieve the bit as a boolean value at idx
position in the vectorThat's it for now.
On v8 this is about twice as fast as the equivalent operation using an object. Here's the jsperf. It is obviously also substantially more memory-efficient. On v8 in particular it should be substantially faster when you need to frequently delete keys, since this puts v8 objects into 'dictionary mode' which is substantially slower.
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Copyright © 2015, Weo.io <info@weo.io>
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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FAQs
Simple, fast bit vectors for javascript. Useful in place of objects where performance is extremely important and your keys are all iteger convertible values)
The npm package bit-vector receives a total of 88 weekly downloads. As such, bit-vector popularity was classified as not popular.
We found that bit-vector demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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