Add JavaScriptTransposeMatrix.md

Author: Superklok

JavaScriptTransposeMatrix.md

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+# JavaScript Transpose Matrix
+
+## Challenge:
+
+Given a 2D integer array `matrix`, return the transpose of `matrix`.
+
+The transpose of a matrix is the matrix flipped over its main diagonal, switching the matrix's row and column indices.
+
+### 1<sup>st</sup> Example:
+
+`Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]`
+<br/>
+`Output: [[1,4,7],[2,5,8],[3,6,9]]`
+
+### 2<sup>nd</sup> Example:
+
+`Input: matrix = [[1,2,3],[4,5,6]]`
+<br/>
+`Output: [[1,4],[2,5],[3,6]]`
+
+### Constraints:
+
+`m == matrix.length`
+<br/>
+`n == matrix[i].length`
+<br/>
+`1 <= m, n <= 1000`
+<br/>
+`1 <= m * n <= 10⁵`
+<br/>
+`-10⁹ <= matrix[i][j] <= 10⁹`
+
+## Solution:
+
+`const transpose = (A) => {`
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`let result = [];`
+<br/>
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`for(let i= 0; i<A[0].length; i++){`
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`let currentColumn = [];`
+<br/>
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`for(let j=0; j<A.length; j++){`
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`currentColumn.push(A[j][i]);`
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`}`
+<br/>
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`result.push(currentColumn);`
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`}`
+<br/>
+<br/>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;`return result;`
+<br/>
+`};`
+<br/>
+<br/>