Solutions With JS

Author: bola-nabil

Medium/59. Spiral Matrix II.js

@@ -0,0 +1,13 @@
+var generateMatrix = function(n) {
+    const M = [...Array(n)].map(() => Array(n).fill(0));
+    let x = 0, y = 0, dx = 1, dy = 0;
+
+    for(let i=1, nn = n**2; i<=nn; i++) {
+        M[y][x] = i;
+        if (!M[y + dy] || M[y + dy][x + dx] !== 0)
+            [dx, dy] = [-dy, dx];
+            x += dx;
+            y += dy
+    }
+    return M;
+};