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[modified] moved dedupe from functional to tablex
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f214be9f59
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@ -112,20 +112,6 @@ function functional.zip(t1, t2, f)
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return ret
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return ret
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end
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end
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--return a copy of a sequence with all duplicates removed
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-- causes a little "extra" gc churn; one table and one closure
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-- as well as the copied deduped table
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function functional.dedupe(t)
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local seen = {}
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return functional.filter(t, function(v)
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if seen[v] then
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return false
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end
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seen[v] = true
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return true
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end)
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end
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-----------------------------------------------------------
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-----------------------------------------------------------
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--common queries and reductions
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--common queries and reductions
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-----------------------------------------------------------
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-----------------------------------------------------------
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14
tablex.lua
14
tablex.lua
@ -146,6 +146,20 @@ function tablex.append(t1, t2)
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return r
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return r
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end
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end
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--return a copy of a sequence with all duplicates removed
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-- causes a little "extra" gc churn of one table to track the duplicates internally
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function tablex.dedupe(t)
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local seen = {}
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local r = {}
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for i,v in ipairs(t) do
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if not seen[v] then
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seen[v] = true
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table.insert(r, v)
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end
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end
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return r
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end
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--(might already exist depending on luajit)
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--(might already exist depending on luajit)
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if table.clear then
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if table.clear then
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--import from global if it exists
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--import from global if it exists
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