Add solution #867

Author: JoshCrozier

README.md

@@ -32,6 +32,7 @@
 819|[Most Common Word](./0819-most-common-word.js)|Easy|
 824|[Goat Latin](./0824-goat-latin.js)|Easy|
 831|[Masking Personal Information](./0831-masking-personal-information.js)|Medium|
+867|[Transpose Matrix](./0867-transpose-matrix.js)|Easy|
 890|[Find and Replace Pattern](./0890-find-and-replace-pattern.js)|Medium|
 916|[Word Subsets](./0916-word-subsets.js)|Medium|
 929|[Unique Email Addresses](./0929-unique-email-addresses.js)|Easy|

solutions/0867-transpose-matrix.js

@@ -0,0 +1,18 @@
+/**
+ * 867. Transpose Matrix
+ * https://leetcode.com/problems/transpose-matrix/
+ * Difficulty: Easy
+ *
+ * Given a matrix A, return the transpose of A.
+ *
+ * The transpose of a matrix is the matrix flipped over it's main
+ * diagonal, switching the row and column indices of the matrix.
+ */
+
+/**
+ * @param {number[][]} A
+ * @return {number[][]}
+ */
+var transpose = function(A) {
+  return A[0].map((_,  i) => A.map(j => j[i]));
+};