Add polyfill for Array includes function. fixes #45

Author: bnmnetp

runestone/common/js/runestonebase.js

@@ -18,3 +18,33 @@ RunestoneBase.prototype.logRunEvent = function (info) {
     console.log("running " + eventInfo);
 };
 
+
+
+if (![].includes) {
+  Array.prototype.includes = function(searchElement /*, fromIndex*/ ) {
+    'use strict';
+    var O = Object(this);
+    var len = parseInt(O.length) || 0;
+    if (len === 0) {
+      return false;
+    }
+    var n = parseInt(arguments[1]) || 0;
+    var k;
+    if (n >= 0) {
+      k = n;
+    } else {
+      k = len + n;
+      if (k < 0) {k = 0;}
+    }
+    var currentElement;
+    while (k < len) {
+      currentElement = O[k];
+      if (searchElement === currentElement ||
+         (searchElement !== searchElement && currentElement !== currentElement)) {
+        return true;
+      }
+      k++;
+    }
+    return false;
+  };
+}