rxjs-trading-signals/dist/ROC/ROC.js

The user - defined operator helps users quickly output index values. base trading-signals library

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.ROC = void 0;
const big_js_1 = __importDefault(require("big.js"));
const rxjs_1 = require("rxjs");
const ROC = (interval) => {
    return (observable) => new rxjs_1.Observable((subscriber) => {
        let price = new big_js_1.default(0);
        const subscription = observable
            .pipe((0, rxjs_1.tap)(x => (price = new big_js_1.default(x))), (0, rxjs_1.bufferCount)(interval + 1, 1), (0, rxjs_1.filter)(x => x.length === interval + 1), (0, rxjs_1.map)(([first]) => price.minus(first).div(first)))
            .subscribe({
            next(x) {
                subscriber.next(x);
            },
            error(err) {
                subscriber.error(err);
            },
            complete() {
                subscriber.complete();
            },
        });
        return () => {
            subscription.unsubscribe();
            price = null;
        };
    });
};
exports.ROC = ROC;
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