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- # Fast Diff [![Build Status](https://travis-ci.org/jhchen/fast-diff.svg)](https://travis-ci.org/jhchen/fast-diff)
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- This is a simplified import of the excellent [diff-match-patch](https://code.google.com/p/google-diff-match-patch/) library by [Neil Fraser](https://neil.fraser.name/) into the Node.js environment. The match and patch parts are removed, as well as all the extra diff options. What remains is incredibly fast diffing between two strings.
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- The diff function is an implementation of ["An O(ND) Difference Algorithm and its Variations" (Myers, 1986)](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.4.6927&rep=rep1&type=pdf) with the suggested divide and conquer strategy along with several [optimizations](http://neil.fraser.name/news/2007/10/09/) Neil added.
-
- ```js
- var diff = require('fast-diff');
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- var good = 'Good dog';
- var bad = 'Bad dog';
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- var result = diff(good, bad);
- // [[-1, "Goo"], [1, "Ba"], [0, "d dog"]]
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- // Respect suggested edit location (cursor position), added in v1.1
- diff('aaa', 'aaaa', 1)
- // [[0, "a"], [1, "a"], [0, "aa"]]
-
- // For convenience
- diff.INSERT === 1;
- diff.EQUAL === 0;
- diff.DELETE === -1;
- ```
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