Refactor loop variables

Author: tshemsedinov

JavaScript/1-for.js

@@ -18,8 +18,7 @@ console.log('Example 2');
 console.log('Example 3');
 
 {
-  let i = 0;
-  for (; i < 3;) {
+  for (let i = 0; i < 3;) {
     console.log(i++);
   }
 }

JavaScript/b-matrix.js

@@ -15,11 +15,10 @@ const res = matrix
 
 console.log(res);
 
-let i, j, row, col;
-for (i in matrix) {
-  row = matrix[i];
-  for (j in row) {
-    col = row[j];
+for (const i in matrix) {
+  const row = matrix[i];
+  for (const j in row) {
+    const col = row[j];
     console.log(i, j, col);
   }
 }

JavaScript/d-matrix-for-in.js

@@ -7,11 +7,10 @@ const matrix = [
   [-6, 4, 8, 2, 0],
 ];
 
-let i, j, row, col;
-for (i in matrix) {
-  row = matrix[i];
-  for (j in row) {
-    col = row[j];
+for (const i in matrix) {
+  const row = matrix[i];
+  for (const j in row) {
+    const col = row[j];
     console.log(i, j, col);
   }
 }