Function score 

pub fn score(text: &str) -> Sentiment

Score text against the built-in lexicons.

The function is total and deterministic: identical inputs always return identical outputs. Empty input returns a Sentiment with all-zero counts and a "neutral" label.

use sentiment_basic::score;

let r = score("");
assert_eq!(r.label(), "neutral");
assert_eq!(r.comparison(), 0.0);