trading-signals/dist/trend/AROON/Aroon.js

Technical indicators to run technical analysis with JavaScript / TypeScript.

import { TechnicalIndicator } from '../../base/Indicator.js';
import { pushUpdate } from '../../util/pushUpdate.js';
export class Aroon extends TechnicalIndicator {
    #candles = [];
    interval;
    constructor(interval) {
        super();
        this.interval = interval;
    }
    getRequiredInputs() {
        return this.interval + 1;
    }
    update(candle, replace) {
        pushUpdate(this.#candles, replace, candle, this.getRequiredInputs());
        if (this.#candles.length < this.getRequiredInputs()) {
            return null;
        }
        let highestIndex = 0;
        let lowestIndex = 0;
        this.#candles.forEach(({ high, low }, i) => {
            if (high >= this.#candles[highestIndex].high) {
                highestIndex = i;
            }
            if (low <= this.#candles[lowestIndex].low) {
                lowestIndex = i;
            }
        });
        const newestIndex = this.#candles.length - 1;
        const aroonDown = (100 * (this.interval - (newestIndex - lowestIndex))) / this.interval;
        const aroonUp = (100 * (this.interval - (newestIndex - highestIndex))) / this.interval;
        return (this.result = { aroonDown, aroonUp });
    }
}
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