Method prevDayStream

src/node-binance-api.ts:6804–6839

* Websocket prevday percentage * @param {array/string} symbols - an array or string of symbols to query * @param {function} callback - callback function * @param {boolean} singleCallback - avoid call one callback for each symbol in data array * @return {string} the websocket endp

(symbols: string[] | string | undefined, callback?: Callback, singleCallback?: Callback)

     * @return {string} the websocket endpoint
     */
    prevDayStream(symbols: string[] | string | undefined, callback?: Callback, singleCallback?: Callback) {
        const reconnect = () => {
            if (this.Options.reconnect) this.prevDayStream(symbols, callback, singleCallback);
        };

        let subscription;
        const prevDayStreamHandler = this.prevDayStreamHandler.bind(this);
        // Combine stream for array of symbols
        if (Array.isArray(symbols)) {
            if (!this.isArrayUnique(symbols)) throw Error('prevDay: "symbols" cannot contain duplicate elements.');
            const streams = symbols.map(function (symbol) {
                return symbol.toLowerCase() + '@ticker';
            });
            subscription = this.subscribeCombined(streams, function (data: any) {
                prevDayStreamHandler(data, callback);
            }, reconnect);
            // Raw stream for  a single symbol
        } else if (symbols) {
            const symbol = symbols;
            subscription = this.subscribe(symbol.toLowerCase() + '@ticker', function (data: any) {
                prevDayStreamHandler(data, callback);
            }, reconnect);
            // Raw stream of all listed symbols
        } else {
            subscription = this.subscribe('!miniTicker@arr', function (data: any) {
                if (singleCallback) {
                    prevDayStreamHandler(data, callback);
                } else {
                    for (const line of data) {
                        prevDayStreamHandler(line, callback);
                    }
                }
            }, reconnect);
        }
        return (subscription as any).url;
    }
}