fast-dice-coefficient

Fastest implementation of Sørensen–Dice coefficient. This implementation has linear time complexity O(n), as opposed to other solutions: string-similarity, dice-coefficient, etc., running in quadratic time O(n²).

This algorithm can be used to compute the similarity between strings. It returns a fraction between 0 and 1, where 0 indicates no match and 1 indicates full match.

Install

$ npm install fast-dice-coefficient --save

Usage

var dice = require('fast-dice-coefficient');

console.log(dice('javascript', 'coffeescript'));
//=> 0.5

Benchmark

200 samples on i7-3667u with 8GB RAM.

Using two test-strings with 100 characters each.

First 4 packages uses dice-coefficient and last uses levenshtein.

Package	ops/sec
stringSimilarity	7,590
natural.DiceCoefficient	11,117
dice-coefficient	14,732
fast-dice-coefficient	44,067
fast-levenshtein	4,495