exchanges by volume

// @NO_AUTO_TRANSPILE
import ccxt from '../../js/ccxt.js';
(async () => {
    //     const exchanges = [
    //         'poloniex',
    //         'bitfinex'
    //     ]
    const exchanges = ccxt.exchanges;
    const symbol = 'BTC/USDT';
    const tickers = {};
    const volumeField = 'baseVolume';
    console.log('-----------------------------------------------------------');
    await Promise.all(exchanges.map(exchangeId => new Promise(async (resolve, reject) => {
        try {
            const exchange = new ccxt[exchangeId]();
            const ticker = await exchange.fetchTicker(symbol);
            if (ticker[volumeField] !== undefined) {
                tickers[exchangeId] = ticker;
            }
        }
        catch (e) {
            console.log(exchangeId, e.message.slice(0, 100));
        }
        resolve(tickers);
    })));
    console.log('-----------------------------------------------------------');
    console.log(Object
        .keys(tickers)
        .sort((a, b) => ((tickers[a][volumeField] > tickers[b][volumeField]) ? 1 : ((tickers[a][volumeField] < tickers[b][volumeField]) ? -1 : 0)))
        .reverse()
        .map(id => ({
        id,
        symbol,
        'volume': tickers[id][volumeField],
    })));
})();