sma-wma.js

function SMA(list, interval) {
    const result = [];

    for (let i = 0; i <= list.length - interval; i++) {
        let sum = 0;

        for (let j = i; j < i + interval; j++) {
            sum += list[j];
        }

        result.push(sum / interval);
    }

    return result;
}

function WMA(list, interval) {
    const result = [];

    for (let i = 0; i <= list.length - interval; i++) {
        let sum = 0;
        let denominator = 0;

        for (let j = i, n = 1; j < i + interval; j++, n++) {
            sum += list[j] * n;
            denominator += n;
        }

        result.push(sum / denominator);
    }

    return result;
}