Code style fixes for matrix rotation algorithm.

Author: trekhleb

src/algorithms/uncategorized/square-matrix-rotation/README.md

@@ -92,13 +92,13 @@ A B C
 / / •
 / • • 
 
-And not let's do horizontal reflection:
+And now let's do horizontal reflection:
 
 A → →
 B → →
 C → →
 
-The string has been rotated to 90 degree.
+The string has been rotated to 90 degree:
 
 • • A
 • • B

src/algorithms/uncategorized/square-matrix-rotation/squareMatrixRotation.js

@@ -8,19 +8,28 @@ export default function squareMatrixRotation(originalMatrix) {
  // Do top-right/bottom-left diagonal reflection of the matrix.
  for (let rowIndex = 0; rowIndex < matrix.length; rowIndex += 1) {
  for (let columnIndex = rowIndex + 1; columnIndex < matrix.length; columnIndex += 1) {
- const tmp = matrix[columnIndex][rowIndex];
- matrix[columnIndex][rowIndex] = matrix[rowIndex][columnIndex];
- matrix[rowIndex][columnIndex] = tmp;
+ // Swap elements.
+ [
+ matrix[columnIndex][rowIndex],
+ matrix[rowIndex][columnIndex],
+ ] = [
+ matrix[rowIndex][columnIndex],
+ matrix[columnIndex][rowIndex],
+ ];
  }
  }
 
  // Do horizontal reflection of the matrix.
  for (let rowIndex = 0; rowIndex < matrix.length; rowIndex += 1) {
  for (let columnIndex = 0; columnIndex < matrix.length / 2; columnIndex += 1) {
- const mirrorColumnIndex = matrix.length - columnIndex - 1;
- const tmp = matrix[rowIndex][mirrorColumnIndex];
- matrix[rowIndex][mirrorColumnIndex] = matrix[rowIndex][columnIndex];
- matrix[rowIndex][columnIndex] = tmp;
+ // Swap elements.
+ [
+ matrix[rowIndex][matrix.length - columnIndex - 1],
+ matrix[rowIndex][columnIndex],
+ ] = [
+ matrix[rowIndex][columnIndex],
+ matrix[rowIndex][matrix.length - columnIndex - 1],
+ ];
  }
  }