Looping Over All Symbols Of Specific Exchanges

import ccxt from '../../js/ccxt.js';
import asTable from 'as-table';
import ansicolor from 'ansicolor';
import ololog from 'ololog';

const log = ololog.configure ({ locate: false }), verbose   = process.argv.includes ('--verbose');

ansicolor.nice

//-----------------------------------------------------------------------------

;(async () => {

   const exchanges = [ 'bittrex', 'poloniex', 'hitbtc2' ]

   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)

           }
       }
   }

}) ()