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local M = {}
-- shallow copies a table, dst optional.
M.copy = function(src, dst)
dst = dst or {}
for k, v in pairs(src) do
dst[k] = v
end
return dst
end
-- recursively copies a table, dst optional.
-- might implode for infinitely nested tables.
M.deepcopy = function(src, dst)
dst = dst or {}
-- convenience.
if type(src) ~= "table" then return src end
for k, v in pairs(src) do
dst[k] = M.deepcopy(v)
end
return dst
end
-- replaces all values of a table with fn(value).
M.map = function(fn, tbl)
local res = M.copy(tbl)
for k, v in pairs(tbl) do
res[k] = fn(v)
end
return res
end
return M
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