@ldrick/trade-indicators/dist/averages/dma.js

Trade Indicators

import { function as F, readonlyArray as RA, readonlyNonEmptyArray as RNEA } from 'fp-ts/lib';
import { amean } from './amean.js';
/**
 * Base implementation for the Exponential Moving Average (EMA) and
 * the Smoothed Moving Average (SMMA) by providing a factor.
 *
 * @internal
 */
export const dma = (values, period, factor) => {
    const [init, rest] = RNEA.splitAt(period)(values);
    return F.pipe(rest, RA.reduce([amean(init)], (reduced, value) => {
        const prev = RNEA.last(reduced);
        return RA.append(value.sub(prev).mul(factor).add(prev))(reduced);
    }));
};