feat(is): add is function

src/is.js

@@ -0,0 +1,16 @@
+/**
+ * Check if the specified value is an object
+ *
+ * @param {*} value The value to check
+ *
+ * @returns {boolean} Whether it is an object
+ */
+function is(value) {
+  // check if the value is an instance of Object
+  return value instanceof Object
+    // check if the value constructor is Object
+    && value.constructor === Object;
+  // if both match the value is truly an object
+}
+
+export default is;