Package Exports

fastest-levenshtein

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 (fastest-levenshtein) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

fastest-levenshtein 🚀

Fastest JavaScript implementation of the Levenshtein distance algorithm - (up to 10x+ faster than closest competitor). This algorithm can be used to measure the similarity of two strings.

Note: if you need to take the edit distance of one string against many strings (maybe billions), I have created a GPU-implementation that will be atleast 1000x faster than this. Contact me, if you're interested.

$ npm i fastest-levenshtein

Usage

const {distance, closest} = require('fastest-levenshtein')

// Print levenshtein-distance between 'fast' and 'faster' 
console.log(distance('fast', 'faster'))
//=> 2

// Print string from array with lowest edit-distance to 'fast'
console.log(closest('fast', ['slow', 'faster', 'fastest']))
//=> 'faster'

Benchmark

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.

Test Target	N=4	N=8	N=16	N=32	N=64	N=128	N=256	N=512	N=1024
fastest-levenshtein	44423	23702	10764	4595	1049	291.5	86.64	22.24	5.473
js-levenshtein	21261	10030	2939	824	223	57.62	14.77	3.717	0.934
leven	19688	6884	1606	436	117	30.34	7.604	1.929	0.478
fast-levenshtein	18577	6112	1265	345	89.41	22.70	5.676	1.428	0.348
levenshtein-edit-distance	22968	7445	1493	409	109	28.07	7.095	1.789	0.445

Relative Performance

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".

Benchmark

License

This project is licensed under the MIT License - see the LICENSE.md file for details