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[tablex] Add rotate
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1d59b3623e
commit
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14
tablex.lua
14
tablex.lua
@ -60,7 +60,19 @@ function tablex.swap_and_pop(t, i)
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tablex.swap(t, i, #t)
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return tablex.pop(t)
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end
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--rotate the elements of a table by amount
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function tablex.rotate(t, amount)
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if amount == 0 then return t end
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if amount > 0 then
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tablex.push(t, tablex.shift(t))
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return tablex.rotate(t, amount - 1)
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elseif amount < 0 then
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tablex.unshift(t, tablex.pop(t))
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return tablex.rotate(t, amount + 1)
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end
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end
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--default comparison; hoisted for clarity
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--(shared with sort.lua and suggests the sorted functions below should maybe be refactored there)
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local function default_less(a, b)
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