Lua table.filter (JavaScript Array::filter equivalent)

table.filter.lua

-- table.filter({"a", "b", "c", "d"}, function(o, k, i) return o >= "c" end)  --> {"c","d"}
--
-- @FGRibreau - Francois-Guillaume Ribreau
-- @Redsmin - A full-feature client for Redis http://redsmin.com
table.filter = function(t, filterIter)
  local out = {}

  for k, v in pairs(t) do
    if filterIter(v, k, t) then out[k] = v end
  end

  return out
end

Note/warning: If you try to iterate the result using ipairs, it'll break (not give you all keys).
The real result of the example (line 1) actually is: { [3] = "c", [4] = "d" }

To make the output a regular iterable array, you can replace :
out[k] = v
by
table.insert(out,v)