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add a key/value pair intersection function
------------------------------------------------------------------------------------
--]]
function p.intersection(...)
local differentVals = {} -- A substitute variable to use when we have different values for the same key.
local ret, track, pairCounts = {}, {}, {}
local lim = select('#', ...)
for i = 1, lim do
local t = select(i, ...)
for k, v in pairs(t) do
local trackVal = track[k]
if trackVal == nil then
track[k] = v
pairCounts[k] = 1
elseif trackVal == v then
pairCounts[k] = pairCounts[k] + 1
end
end
end
for k, v in pairs(track) do
if pairCounts[k] == lim then
ret[k] = v
end
end
return ret
end
--[[