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added tablex.previous_element
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14
tablex.lua
14
tablex.lua
@ -182,6 +182,20 @@ function tablex.next_element(t, v)
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return t[i]
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return t[i]
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end
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end
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function tablex.previous_element(t, v)
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local i = tablex.index_of(t, v)
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--not present? just get the front of the table
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if not i then
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return tablex.front(t)
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end
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--(not using mathx to avoid inter-dependency)
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i = i - 1
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if i == 0 then
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i = #t
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end
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return t[i]
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end
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--note: keyed versions of the above aren't required; you can't double
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--note: keyed versions of the above aren't required; you can't double
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--up values under keys
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--up values under keys
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