Add getPrototype helper.

lodash.js

@@ -1364,7 +1364,6 @@
         Uint8Array = context.Uint8Array,
         clearTimeout = context.clearTimeout,
         enumerate = Reflect ? Reflect.enumerate : undefined,
-        getPrototypeOf = Object.getPrototypeOf,
         getOwnPropertySymbols = Object.getOwnPropertySymbols,
         iteratorSymbol = typeof (iteratorSymbol = Symbol && Symbol.iterator) == 'symbol' ? iteratorSymbol : undefined,
         objectCreate = Object.create,
@@ -1375,6 +1374,7 @@
     /* Built-in method references for those with the same name as other `lodash` methods. */
     var nativeCeil = Math.ceil,
         nativeFloor = Math.floor,
+        nativeGetPrototype = Object.getPrototypeOf,
         nativeIsFinite = context.isFinite,
         nativeJoin = arrayProto.join,
         nativeKeys = Object.keys,
@@ -2774,7 +2774,7 @@
       // that are composed entirely of index properties, return `false` for
       // `hasOwnProperty` checks of them.
       return hasOwnProperty.call(object, key) ||
-        (typeof object == 'object' && key in object && getPrototypeOf(object) === null);
+        (typeof object == 'object' && key in object && getPrototype(object) === null);
     }
 
     /**
@@ -5068,6 +5068,17 @@
       return object.placeholder;
     }
 
+    /**
+     * Gets the `[[Prototype]]` of `value`.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @returns {null|Object} Returns the `[[Prototype]]`.
+     */
+    function getPrototype(value) {
+      return nativeGetPrototype(Object(value));
+    }
+
     /**
      * Creates an array of the own enumerable symbol properties of `object`.
      *
@@ -5100,7 +5111,7 @@
       var result = [];
       while (object) {
         arrayPush(result, getSymbols(object));
-        object = getPrototypeOf(object);
+        object = getPrototype(object);
       }
       return result;
     };
@@ -5227,7 +5238,7 @@
      */
     function initCloneObject(object) {
       return (typeof object.constructor == 'function' && !isPrototype(object))
-        ? baseCreate(getPrototypeOf(object))
+        ? baseCreate(getPrototype(object))
         : {};
     }
 
@@ -10636,7 +10647,7 @@
           objectToString.call(value) != objectTag || isHostObject(value)) {
         return false;
       }
-      var proto = getPrototypeOf(value);
+      var proto = getPrototype(value);
       if (proto === null) {
         return true;
       }
@@ -12344,7 +12355,7 @@
           if (isArr) {
             accumulator = isArray(object) ? new Ctor : [];
           } else {
-            accumulator = isFunction(Ctor) ? baseCreate(getPrototypeOf(object)) : {};
+            accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
           }
         } else {
           accumulator = {};