for loopified

solutions/04.ts

@@ -27,14 +27,12 @@ class DayFour implements Solvable {
             let [b,a] = [0, mat[0].length - 1]
             const lines = []
             while (b < mat.length) {
-                let [y,x] = [b,a]
+
+
                 let line = ''
-                // walk top left of diagonal to bottom right
-                while (x < mat[y].length && y < mat.length - 1) {
+                for (let [y,x] = [b,a]; x < mat[y].length && y < mat.length - 1; y++,x++)
                     line += mat[y][x]
-                    y++
-                    x++
-                }
+
                 lines.push(line.split(''))
 
                 if (a > 0) {