55 lines
2.5 KiB
Markdown
55 lines
2.5 KiB
Markdown
# fastest-levenshtein :rocket:
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> Fastest JS implemenation of [Levenshtein distance](https://en.wikipedia.org/wiki/Levenshtein_distance).<br>
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> Measure the difference between two strings.
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[](https://travis-ci.org/ka-weihe/node-levenshtein)
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[](https://coveralls.io/github/ka-weihe/node-levenshtein?branch=master)
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```
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$ npm i fastest-levenshtein
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```
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## Usage
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### Node
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```javascript
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const {distance, closest} = require('fastest-levenshtein')
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// Print levenshtein-distance between 'fast' and 'faster'
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console.log(distance('fast', 'faster'))
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//=> 2
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// Print string from array with lowest edit-distance to 'fast'
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console.log(closest('fast', ['slow', 'faster', 'fastest']))
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//=> 'faster'
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```
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### Deno
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```javascript
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import {distance, closest} from 'https://deno.land/x/fastest_levenshtein/mod.ts'
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// Print levenshtein-distance between 'fast' and 'faster'
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console.log(distance('fast', 'faster'))
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//=> 2
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// Print string from array with lowest edit-distance to 'fast'
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console.log(closest('fast', ['slow', 'faster', 'fastest']))
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//=> 'faster'
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```
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## Benchmark
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I generated 500 pairs of strings with length N. I measured the ops/sec each library achieves to process all the given pairs. Higher is better. `fastest-levenshtein` is a lot faster in all cases.
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| Test Target | N=4 | N=8 | N=16 | N=32 | N=64 | N=128 | N=256 | N=512 | N=1024 |
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|---------------------------|-------|-------|-------|------|-------|-------|-------|-------|--------|
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| fastest-levenshtein | 44423 | 23702 | 10764 | 4595 | 1049 | 291.5 | 86.64 | 22.24 | 5.473 |
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| js-levenshtein | 21261 | 10030 | 2939 | 824 | 223 | 57.62 | 14.77 | 3.717 | 0.934 |
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| leven | 19688 | 6884 | 1606 | 436 | 117 | 30.34 | 7.604 | 1.929 | 0.478 |
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| fast-levenshtein | 18577 | 6112 | 1265 | 345 | 89.41 | 22.70 | 5.676 | 1.428 | 0.348 |
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| levenshtein-edit-distance | 22968 | 7445 | 1493 | 409 | 109 | 28.07 | 7.095 | 1.789 | 0.445 |
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### Relative Performance
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This image shows the relative performance between `fastest-levenshtein` and `js-levenshtein` (the 2nd fastest). `fastest-levenshtein` is always a lot faster. x-axis shows "times faster".
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## License
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This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details
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