Remove isHostObject helper.

.travis.yml

@@ -56,15 +56,14 @@ before_install:
 
   # Remove code skipped on the coverage run.
   - |
-      PATTERN[0]="|\s*if\s*\(isHostObject\b[\s\S]+?\}(?=\n)|"
-      PATTERN[1]="|\s*if\s*\(enumerate\b[\s\S]+?\};\s*\}|"
-      PATTERN[2]="|\s*while\s*\([^)]+\)\s*\{\s*iteratee\(index\);\s*\}|"
-      PATTERN[3]="|\s*else\s*\{\s*assocSet\(data\b[\s\S]+?\}|"
-      PATTERN[4]="|\bcase\s+(?:dataView|promise|set|map|weakMap)CtorString:.+|g"
-      PATTERN[5]="|\bindex,\s*iterable\)\s*===\s*false\)[^}]+?(break;)|"
-      PATTERN[6]="|\s*if\s*\(\!lodashFunc\)\s*\{\s*return;\s*\}|"
-      PATTERN[7]="|\s*define\([\s\S]+?\);|"
-      PATTERN[8]="|\s*root\._\s*=\s*_;|"
+      PATTERN[0]="|\s*if\s*\(enumerate\b[\s\S]+?\};\s*\}|"
+      PATTERN[1]="|\s*while\s*\([^)]+\)\s*\{\s*iteratee\(index\);\s*\}|"
+      PATTERN[2]="|\s*else\s*\{\s*assocSet\(data\b[\s\S]+?\}|"
+      PATTERN[3]="|\bcase\s+(?:dataView|promise|set|map|weakMap)CtorString:.+|g"
+      PATTERN[4]="|\bindex,\s*iterable\)\s*===\s*false\)[^}]+?(break;)|"
+      PATTERN[5]="|\s*if\s*\(\!lodashFunc\)\s*\{\s*return;\s*\}|"
+      PATTERN[6]="|\s*define\([\s\S]+?\);|"
+      PATTERN[7]="|\s*root\._\s*=\s*_;|"
 
       if [ $ISTANBUL == true ]; then
         set -e

lodash.js

@@ -1164,25 +1164,6 @@
     return reHasUnicodeWord.test(string);
   }
 
-  /**
-   * Checks if `value` is a host object in IE < 9.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
-   */
-  function isHostObject(value) {
-    // Many host objects are `Object` objects that can coerce to strings
-    // despite having improperly defined `toString` methods.
-    var result = false;
-    if (value != null && typeof value.toString != 'function') {
-      try {
-        result = !!(value + '');
-      } catch (e) {}
-    }
-    return result;
-  }
-
   /**
    * Converts `iterator` to an array.
    *
@@ -2532,9 +2513,6 @@
           return cloneBuffer(value, isDeep);
         }
         if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
-          if (isHostObject(value)) {
-            return object ? value : {};
-          }
           result = initCloneObject(isFunc ? {} : value);
           if (!isDeep) {
             return copySymbols(value, baseAssign(result, value));
@@ -3178,8 +3156,8 @@
         othTag = getTag(other);
         othTag = othTag == argsTag ? objectTag : othTag;
       }
-      var objIsObj = objTag == objectTag && !isHostObject(object),
-          othIsObj = othTag == objectTag && !isHostObject(other),
+      var objIsObj = objTag == objectTag,
+          othIsObj = othTag == objectTag,
           isSameTag = objTag == othTag;
 
       if (isSameTag && !objIsObj) {
@@ -3284,7 +3262,7 @@
       if (!isObject(value) || isMasked(value)) {
         return false;
       }
-      var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
+      var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
       return pattern.test(toSource(value));
     }
 
@@ -11713,8 +11691,7 @@
      * // => true
      */
     function isPlainObject(value) {
-      if (!isObjectLike(value) ||
-          objectToString.call(value) != objectTag || isHostObject(value)) {
+      if (!isObjectLike(value) || objectToString.call(value) != objectTag) {
         return false;
       }
       var proto = getPrototype(value);

test/test.js

@@ -10495,22 +10495,6 @@
       }
     });
 
-    QUnit.test('should work with host objects in IE 8 document mode (test in IE 11)', function(assert) {
-      assert.expect(2);
-
-      // Trigger a Chakra JIT bug.
-      // See https://github.com/jashkenas/underscore/issues/1621.
-      lodashStable.each([body, xml], function(object) {
-        if (object) {
-          lodashStable.times(100, _.isFunction);
-          assert.strictEqual(_.isFunction(object), false);
-        }
-        else {
-          skipAssert(assert);
-        }
-      });
-    });
-
     QUnit.test('should work with a function from another realm', function(assert) {
       assert.expect(1);