added examples/order-book-extra-level-depth-param

examples/js/order-book-extra-level-depth-param.js

@@ -0,0 +1,19 @@
+"use strict";
+
+const ccxt = require ('../../ccxt')
+const asTable = require ('as-table')
+const log = require ('ololog')
+
+require ('ansicolor').nice;
+
+(async function test () {
+
+    const exchange = new ccxt.bitfinex ()
+    const orders = await exchange.fetchOrderBook ('BTC/USD', {
+        'limit_bids': 5, // max = 50
+        'limit_asks': 5, // may be 0 in which case the array is empty
+        'group': 1, // 1 = orders are grouped by price, 0 = orders are separate
+    })
+
+    log (orders)
+}) ()

examples/php/order-book-level-depth-extra-param.php

@@ -0,0 +1,17 @@
+<?php
+
+$root = dirname (dirname (dirname (__FILE__)));
+
+include $root . '/build/ccxt.php';
+
+date_default_timezone_set ('UTC');
+
+// instantiate the exchange by id
+$exchange = '\\ccxt\\kraken';
+$exchange = new $exchange ();
+var_dump ($exchange->fetch_order_book ('BTC/USD', array (
+    'count' => 10, // up to ten order on each side for example
+)));
+
+
+?>

examples/py/order-book-extra-level-depth-param.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+import os
+import sys
+
+root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+sys.path.append(root)
+
+import ccxt  # noqa: E402
+
+# return up to ten bidasks on each side of the order book stack
+print(ccxt.cex().fetch_order_book('BTC/USD', {'depth': 10}))