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Task/Sorting-algorithms-Cocktail-sort/Phix/sorting-algorithms-cocktail-sort.phix

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+function cocktail_sort(sequence s)
+integer swapped = 1, f = 1, t = length(s)-1, d = 1
+    while swapped do
+        swapped = 0
+        for i=f to t by d do
+            if s[i]>s[i+1] then
+                {s[i],s[i+1],swapped} = {s[i+1],s[i],1}
+            end if
+        end for
+        -- swap to and from, and flip direction.
+        -- additionally, we can reduce one element to be
+        -- examined, depending on which way we just went.
+        {f,t,d} = {t-(d=1),f-(d=-1),-d}
+    end while
+    return s
+end function
+
+constant s = sq_rand(repeat(1000,10))
+? s
+? cocktail_sort(s)