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Task/Spiral-matrix/JavaScript/spiral-matrix.js

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+spiralArray = function (edge) {
+    var arr = Array(edge),
+        x = 0, y = edge,
+        total = edge * edge--,
+        dx = 1, dy = 0,
+        i = 0, j = 0;
+    while (y) arr[--y] = [];
+    while (i < total) {
+        arr[y][x] = i++;
+        x += dx; y += dy;
+        if (++j == edge) {
+            if (dy < 0) {x++; y++; edge -= 2}
+            j = dx; dx = -dy; dy = j; j = 0;
+       }
+    }
+    return arr;
+}
+
+// T E S T:
+arr = spiralArray(edge = 5);
+for (y= 0; y < edge; y++) console.log(arr[y].join(" "));