Add solution #2011

Author: JoshCrozier

README.md

@@ -211,6 +211,7 @@
 1929|[Concatenation of Array](./1929-concatenation-of-array.js)|Easy|
 1935|[Maximum Number of Words You Can Type](./1935-maximum-number-of-words-you-can-type.js)|Easy|
 2000|[Reverse Prefix of Word](./2000-reverse-prefix-of-word.js)|Easy|
+2011|[Final Value of Variable After Performing Operations](./2011-final-value-of-variable-after-performing-operations.js)|Easy|
 2016|[Maximum Difference Between Increasing Elements](./2016-maximum-difference-between-increasing-elements.js)|Easy|
 
 ## License

solutions/2011-final-value-of-variable-after-performing-operations.js

@@ -0,0 +1,24 @@
+/**
+ * 2011. Final Value of Variable After Performing Operations
+ * https://leetcode.com/problems/final-value-of-variable-after-performing-operations/
+ * Difficulty: Easy
+ *
+ * There is a programming language with only four operations and one variable X:
+ * - ++X and X++ increments the value of the variable X by 1.
+ * - --X and X-- decrements the value of the variable X by 1.
+ *
+ * Initially, the value of X is 0.
+ *
+ * Given an array of strings operations containing a list of operations, return the
+ * final value of X after performing all the operations.
+ */
+
+/**
+ * @param {string[]} operations
+ * @return {number}
+ */
+var finalValueAfterOperations = function(operations) {
+  return operations
+    .map(n => n.includes('++') ? 1 : -1)
+    .reduce((sum, n) => sum + n, 0);
+};