fasteval2 2.1.1

Fast evaluation of algebraic expressions
Documentation 
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use fasteval2::{ez_eval, Error};

use std::collections::BTreeMap;

#[test]
fn ez() {
    assert_eq!(
        ez_eval("3+3-3/3", &mut BTreeMap::<String, f64>::new()),
        Ok(5.0)
    );
    assert_eq!(
        ez_eval("3abc+3-3/3", &mut BTreeMap::<String, f64>::new()),
        Err(Error::UnparsedTokensRemaining("abc+3-3/3".to_string()))
    );
    assert_eq!(
        ez_eval("z+z-z/z", &mut {
            let mut m = BTreeMap::<String, f64>::new();
            m.insert("x".to_string(), 1.0);
            m.insert("y".to_string(), 2.0);
            m.insert("z".to_string(), 3.0);
            m
        }),
        Ok(5.0)
    );
}