Find polyfill

assets/scripts/src/lib/polyfills.js

@@ -79,4 +79,29 @@ if (!Array.from) {
             return A;
         };
     }());
+}
+
+// Reference: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/find
+if (!Array.prototype.find) {
+  Array.prototype.find = function(predicate) {
+    'use strict';
+    if (this == null) {
+      throw new TypeError('Array.prototype.find called on null or undefined');
+    }
+    if (typeof predicate !== 'function') {
+      throw new TypeError('predicate must be a function');
+    }
+    var list = Object(this);
+    var length = list.length >>> 0;
+    var thisArg = arguments[1];
+    var value;
+
+    for (var i = 0; i < length; i++) {
+      value = list[i];
+      if (predicate.call(thisArg, value, i, list)) {
+        return value;
+      }
+    }
+    return undefined;
+  };
 }