Sentiment is a Node.js module that uses the AFINN-111 wordlist to perform sentiment analysis on arbitrary blocks of input text. Sentiment provides serveral things:
- A fully async interface for performing sentiment analysis
- A build process that makes updating sentiment to future versions of the AFINN word list trivial
- Performance (see benchmarks below)
npm install sentimentvar sentiment = require('sentiment');
sentiment('Cats are stupid.', function (err, result) {
console.dir(result); // Score: -2, Comparative: -0.666
});
sentiment('Cats are totally amazing!', function (err, result) {
console.dir(result); // Score: 4, Comparative: 1
});You can append and/or overwrite values from AFINN by simply injecting key/value pairs into a sentiment method call:
var sentiment = require('sentiment');
sentiment('Cats are totally amazing!', {
'cats': 5,
'amazing': 2
}, function (err, result) {
console.dir(result); // Score: 7, Comparative: 1.75
});npm testThe primary motivation for designing sentiment was performance. As such, sentiment includes a benchmark script within the test directory that compares it against the Sentimental module which provides a nearly equivalent interface and approach. Based on these benchmarks, running on an older MacBook Air with Node 0.8.9, sentiment is about 33 times faster than the alternative implementation:
sentiment (v0.1.0)
1000 operations | 33ms
2000 operations | 75ms
4000 operations | 138ms
8000 operations | 252ms
16000 operations | 506ms
32000 operations | 1120ms
64000 operations | 2268ms
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Sentimental (v0.0.2)
1000 operations | 1189ms
2000 operations | 2392ms
4000 operations | 4760ms
8000 operations | 9469ms
16000 operations | 19513ms
32000 operations | 41018ms
64000 operations | 86931ms