Add solution #2618

Author: JoshCrozier

README.md

@@ -361,6 +361,7 @@
 2490|[Circular Sentence](./2490-circular-sentence.js)|Easy|
 2529|[Maximum Count of Positive Integer and Negative Integer](./2529-maximum-count-of-positive-integer-and-negative-integer.js)|Easy|
 2535|[Difference Between Element Sum and Digit Sum of an Array](./2535-difference-between-element-sum-and-digit-sum-of-an-array.js)|Easy|
+2618|[Check if Object Instance of Class](./2618-check-if-object-instance-of-class.js)|Medium|
 3392|[Count Subarrays of Length Three With a Condition](./3392-count-subarrays-of-length-three-with-a-condition.js)|Easy|
 3396|[Minimum Number of Operations to Make Elements in Array Distinct](./3396-minimum-number-of-operations-to-make-elements-in-array-distinct.js)|Easy|
 3397|[Maximum Number of Distinct Elements After Operations](./3397-maximum-number-of-distinct-elements-after-operations.js)|Medium|

solutions/2618-check-if-object-instance-of-class.js

@@ -0,0 +1,24 @@
+/**
+ * 2618. Check if Object Instance of Class
+ * https://leetcode.com/problems/check-if-object-instance-of-class/
+ * Difficulty: Medium
+ *
+ * Write a function that checks if a given value is an instance of a given class or superclass.
+ * For this problem, an object is considered an instance of a given class if that object has
+ * access to that class's methods.
+ *
+ * There are no constraints on the data types that can be passed to the function. For example,
+ * the value or the class could be undefined.
+ */
+
+/**
+ * @param {*} obj
+ * @param {*} classFunction
+ * @return {boolean}
+ */
+var checkIfInstanceOf = function(obj, classFunction) {
+  if (obj === null || obj === undefined || typeof classFunction !== 'function') {
+    return false;
+  }
+  return Object(obj) instanceof classFunction;
+};