Binance Fetch Ohlcv Many Symbols Async Await

'use strict';

const ccxt = require ('../../js/ccxt.js')

console.log('CCXT Version:', ccxt.version)

async function symbolLoop (exchange, symbol, timeframe) {
   while (true) {
       try {
           const ohlcvs = await exchange.fetchOHLCV (symbol, timeframe)
           console.log (exchange.iso8601 (exchange.milliseconds ()), exchange.id, symbol, ohlcvs.length, 'OHLCV candles received')
           // await exchange.sleep (60 * 1000) // sleep if necessary, though not required
       } catch (e) {
           console.log (exchange.iso8601 (exchange.milliseconds ()), exchange.id, symbol, e.constructor.name, e.message)
       }
   }
}

async function main () {
   const exchange = new ccxt.binance ()
   await exchange.loadMarkets ()
   // exchange.verbose = true // uncomment for debugging purposes if necessary
   const symbols = [
       'BTC/USDT', // unified symbols used here as opposed to exchange-specific market ids
       'ETH/USDT', // more about unified symbols vs exchange-specific ids here:
       'ADA/USDT', // https://github.com/ccxt/ccxt/wiki/Manual#markets
   ]
   const timeframe = '1m'
   const loops = symbols.map (symbol => symbolLoop (exchange, symbol, timeframe))
   await Promise.all (loops)
}


main ()