[Matrix] StephenGrider#14 Complete

exercises/matrix/index.js

@@ -15,6 +15,60 @@
 //     [11, 16, 15, 6],
 //     [10,  9,  8, 7]]
 
-function matrix(n) {}
+function matrix(n) {
+      const results = [];
+
+      // Precreate all the empty subarray 
+      for (let i = 0; i < n; i++){
+            results.push([]);
+      }
+
+      // Global Counter Variable
+      let counter = 1;
+
+      // Start will always at 0
+      let startCol = 0;
+      let startRow = 0;
+
+      // End will always start at n - 1
+      let endCol = n - 1;
+      let endRow = n - 1;
+
+      while (startCol <= endCol && startRow <= endRow) {
+
+            // Building top row 
+            for (let i = startCol; i <= endCol; i++){
+                  results[startCol][i] = counter;
+                  counter++;
+            }
+            startRow++;
+
+            // Building far right col
+            for (let i = startRow; i <= endRow; i++){
+                  results[i][endRow] = counter;
+                  counter++;
+            }
+            endCol--;
+
+            // Building bottom row 
+            for (let i = endCol; i >= startCol; i--){
+                  results[endRow][i] = counter;
+                  counter++;
+            }
+            endRow--;
+
+            // Building far left col
+            for (let i = endRow; i >= startRow; i--){
+                  results[i][startCol] = counter;
+                  counter++;
+            }
+            startCol++;
+
+
+
+      }
+
+      return results;
+}
 
 module.exports = matrix;