Symmetric difference: Difference between revisions

=={{header|Lua}}==

<lang lua>A = { ["John"] = true, ["Bob"] = true, ["Mary"] = true, ["Serena"] = true }

B = { ["Jim"] = true, ["Mary"] = true, ["John"] = true, ["Bob"] = true }

A_B = {}

for a in pairs(A) do

if not B[a] then A_B[a] = true end

end

B_A = {}

for b in pairs(B) do

if not A[b] then B_A[b] = true end

end

for a_b in pairs(A_B) do

print( a_b )

end

for b_a in pairs(B_A) do

print( b_a )

end</lang>