ema

// Exponential Moving Average (build_typed accepts init=first_sample|sma for the seed; first_sample is the default)
// Defaults of "ema" (see the indicator reference)
let params = HashMap::from([
    ("period".to_string(), 20.0),
]);
let mut indicator = build_checked("ema", &params)?;

for bar in &bars {
    if let Some(output) = indicator.on_bar(bar) {
        // output.value, output.extra[...], indicator.alerts()
    }
}