added examples/js/fetch-ticker-from-multiple-exchanges.js

examples/js/fetch-ticker-from-multiple-exchanges.js

@@ -0,0 +1,32 @@
+"use strict";
+
+const ccxt = require ('../../ccxt.js')
+
+;(async () => {
+
+    const exchanges = [
+        'bittrex',
+        'poloniex',
+    ]
+
+    const symbol = 'BTC/USDT'
+    const tickers = {}
+
+    console.log (await Promise.all (exchanges.map (exchangeId => new Promise (async (resolve, reject) => {
+
+        const exchange = new ccxt[exchangeId] ({ enableRateLimit: true })
+
+        while (true) {
+
+            const ticker = await exchange.fetchTicker (symbol)
+            tickers[exchangeId] = ticker;
+
+            Object.keys (tickers).map (exchangeId => {
+                const ticker = tickers[exchangeId]
+                console.log (ticker['datetime'], exchangeId, ticker['bid'], ticker['ask']);
+            })
+        }
+
+    }))))
+
+}) ()