fasteval 0.2.4

Fast evaluation of algebraic expressions
Documentation 
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use fasteval::{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));
}