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Task/Zig-zag-matrix/Sidef/zig-zag-matrix.sidef

@@ -0,0 +1,24 @@
+func zig_zag(w, h) {
+
+    var r = [];
+    var n = 0;
+
+    h.of { |e|
+        w.of { |f|
+            [e-1, f-1]
+        }
+    } \
+    -> reduce('+') \
+    -> sort { |a, b|
+           (a[0]+a[1] <=> b[0]+b[1]) ||
+           (a[0]+a[1] -> is_even ? a[0]<=>b[0]
+                                 : a[1]<=>b[1])
+    } \
+    -> each { |a|
+       r[a[1]][a[0]] = n++;
+    }
+
+    return r;
+}
+
+zig_zag(5, 5).each {say .join('', {|i| "%4i" % i})};