Ordered Table

The order of elements when traversing the table (pairs) in lua is unpredictable. In OrderedTable, the traversal order always corresponds to the order in which keys are added.

Example

local tbl = OrderedTable()
tbl.a = 5
tbl.b = 6
tbl.c = 8
tbl.d = 9
print(#tbl) --> 4

for k, v in pairs(tbl) do print(k,v) end --> a 5, b 6, c 8, d 9

tbl.b = nil
print(#tbl) --> 3

for k, v in pairs(tbl) do print(k,v) end --> a 5, c 8, d 9

local tbl_2 = OrderedTable()
print(getmetatable(tbl) == getmetatable(tbl_2)) --> true