Function map

src/selector.rs:211–221

(helper: &MyHelper, vs: Vec<IDLValue>, func: &str)

}

fn map(helper: &MyHelper, vs: Vec<IDLValue>, func: &str) -> Result<Vec<IDLValue>> {
    let mut new_helper = helper.spawn();
    let mut res = Vec::with_capacity(vs.len());
    for v in vs.into_iter() {
        new_helper.env.0.insert(String::new(), v);
        let arg = Exp::Path(String::new(), Vec::new());
        let exp = Exp::Apply(func.to_string(), vec![arg]);
        res.push(exp.eval(&new_helper)?);
    }
    Ok(res)
}

fn filter(helper: &MyHelper, vs: Vec<IDLValue>, func: &str) -> Result<Vec<IDLValue>> {
    let mut new_helper = helper.spawn();