From 16cac70aeed7c0079db67f7a5dc31a4a8038b1f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Estev=C3=A3o=20Soares=20dos=20Santos?=
 <estevao.santos@gmail.com>
Date: Sun, 3 Apr 2022 09:36:37 +0100
Subject: [PATCH] fix: add polyfill method for array.isArray

Closes #497
---
 src/helpers.js | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/helpers.js b/src/helpers.js
index e9403f1..ed33147 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -47,7 +47,15 @@ showdown.helper.isFunction = function (a) {
  */
 showdown.helper.isArray = function (a) {
   'use strict';
-  return Array.isArray(a);
+  let isArray;
+  if (!Array.isArray) {
+    isArray = function (arg) {
+      return Object.prototype.toString.call(arg) === '[object Array]';
+    };
+  } else {
+    isArray = Array.isArray;
+  }
+  return isArray(a);
 };
 
 /**