Looping Over All Symbols Of Specific Exchanges

// @NO_AUTO_TRANSPILE
import ccxt from '../../js/ccxt.js';
import ansicolor from 'ansicolor';
import ololog from 'ololog';
const log = ololog.configure({ locate: false }), verbose = process.argv.includes('--verbose');
ansicolor.nice;
(async () => {
    const exchanges = ['poloniex', 'hitbtc'];
    for (let exchangeId of exchanges) {
        // create the exchange instance
        const exchange = new ccxt[exchangeId]();
        // preload all markets first, as explained in the Manual:
        // https://github.com/ccxt/ccxt/wiki/Manual#loading-markets
        // add error/exception handling as required by the Manual:
        // https://github.com/ccxt/ccxt/wiki/Manual#error-handling
        try {
            await exchange.loadMarkets();
        }
        catch (e) {
            log.red('Could not load markets from', exchange.id + ':', e.constructor.name, e.message);
            continue; // skip this exchange if markets failed to load
        }
        for (let symbol in exchange.markets) {
            console.log(exchange.id, symbol);
            // add error/exception handling as required by the Manual:
            // https://github.com/ccxt/ccxt/wiki/Manual#error-handling
            try { // try fetching the ticker for a symbol existing with that exchange
                const ticker = await exchange.fetchTicker(symbol);
                log.green(ticker);
            }
            catch (e) { // catch the error (if any) and handle it or ignore it
                log.red('Could not fetch', symbol, 'ticker from', exchange.id + ':', e.constructor.name, e.message);
            }
        }
    }
})();