How to use the binary-extensions.forEach function in binary-extensions

*
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';
var path = require('path');
var binaryExtensions = require('binary-extensions');
var exts = Object.create(null);

binaryExtensions.forEach(function (el) {
	exts[el] = true;
});

module.exports = function (filepath) {
	return path.extname(filepath).slice(1).toLowerCase() in exts;
};