Pascal's triangle: Difference between revisions

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@@ Line 2,512: / Line 2,512: @@
     const pascal = n =>
         foldl(a => {
-            const lstPreviousRow = a.slice(-1)[0];
+            const xs = a.slice(-1)[0]; // Previous row
             return append(a, [
-                zipWith((a, b) => a + b, append([0], lstPreviousRow),
+                zipWith(
-                    append(lstPreviousRow, [0]))
+                    (a, b) => a + b,
+                    append([0], xs),
+                    append(xs, [0])
+                )
             ]);
         }, [
-            [1]
+            [1] // Initial seed row
         ], enumFromTo(1, n - 1));
     // GENERIC FUNCTIONS ------------------------------------------------------